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Type 2 diabetes and hypertension are main public well being challenges in sub-Saharan Africa, but therapy management stays poor. Patient adherence to key therapy pillars (remedy, way of life recommendation, and self-monitoring) is crucial for therapy management, but adherence throughout these pillars has not been comprehensively synthesized. We carried out a scientific assessment and meta-analysis to map adherence to remedy, way of life recommendation, and self-monitoring for kind 2 diabetes and hypertension in sub-Saharan Africa, and utilized a community evaluation to determine cross-cutting determinants as precedence candidates for future interventional research.
We searched six educational databases, and Google Scholar, for observational and interventional research in adults with kind 2 diabetes or hypertension in sub-Saharan Africa printed between January 1, 2004, and May 14, 2026. Risk of bias was assessed utilizing Newcastle–Ottawa Scale and Cochrane RoB 2. We used random-effects fashions to pool adherence proportions and carried out subgroup analyses and meta-regressions. Cross-cutting determinants have been recognized utilizing interactive community evaluation with noteworthiness scores. We included 312 research with 108,014 individuals from 28 nations. Pooled adherence was 67% (95% CI [60, 73]) for antidiabetic medicines, 51% (95% CI [44, 58]) for antihypertensive medicines, 44% (95% CI [38, 49]) for dietary suggestions, 42% (95% CI [37, 47]) for bodily exercise, 85% (95% CI [82, 88]) for alcohol abstinence, 95% (95% CI [94, 96]) for smoking cessation, 18% (95% CI [12, 27]) for glucose monitoring, and 28% (95% CI [16, 45]) for blood stress monitoring. Overall self-care adherence was 37% (95% CI [30, 46]) for kind 2 diabetes and 35% (95% CI [29, 42]) for hypertension. Heterogeneity was excessive (I2 > 95%, p < 0.001 all through). Education, self-efficacy, and social assist emerged as cross-cutting determinants most constantly related to adherence. A key limitation is the excessive statistical heterogeneity, which endured regardless of random-effects modeling and subgroup analyses.
Citation: Apostolou A, Simfukwe R, Saint A, Mushani B, Chekhchar H, Aovare P, et al. (2026) Adherence to medicines, way of life recommendation, and self-monitoring for kind 2 diabetes and hypertension in sub-Saharan Africa: A scientific assessment, meta-analysis, and interactive community evaluation. PLoS Med 23(8):
e1005189.
https://doi.org/10.1371/journal.pmed.1005189
Academic Editor: David Flood, Wuqu’ Kawoq | Maya Health Alliance, GUATEMALA
Received: January 21, 2026; Accepted: July 14, 2026; Published: August 3, 2026
Copyright: © 2026 Apostolou et al. This is an open entry article distributed below the phrases of the Creative Commons Attribution License, which allows unrestricted use, distribution, and copy in any medium, offered the unique writer and supply are credited.
Data Availability: All knowledge underlying the findings are totally obtainable within the manuscript and its Supporting information information. The R code for the interactive community evaluation is overtly obtainable on GitHub (https://github.com/hannahchek/networkanalysis). The evaluation code is completely archived on Zenodo (https://doi.org/10.5281/zenodo.20140866).
Funding: This work was supported by a ZonMw Off Road grant (04510242410063) awarded to FPC (https://www.zonmw.nl/en/program/road-doing-research-beaten-track). The funders had no function in examine design, knowledge assortment and evaluation, determination to publish, or preparation of the manuscript.
Competing pursuits: The authors have declared that no competing pursuits exist.
Abbreviations:
CIs,
confidence intervals; GLMM,
generalized linear blended fashions; HRs,
hazard ratios; MMAS-8,
Morisky Medication Adherence Scale; NCD,
noncommunicable illness; NOS,
Newcastle–Ottawa Scale; ORs,
odds ratios; PRs,
prevalence ratios; PRISMA,
Preferred Reporting Items for Systematic Reviews and Meta-Analyses; RRs,
relative dangers; SDSCA,
Summary of Diabetes Self-Care Activities
Cardiometabolic ailments corresponding to kind 2 diabetes and hypertension are a serious public well being problem in sub-Saharan Africa [1–3]. While infectious ailments have been the predominant well being burden earlier than the Nineties [4], the prevalence of cardiometabolic ailments has risen sharply over the previous three a long time, contributing considerably to morbidity and mortality [1–3]. For instance, the prevalence of kind 2 diabetes amongst adults has almost doubled, growing from 6.4% in 1990 to 10.5% in 2021 [1], whereas hypertension now impacts about 37.4% of adults [5]. This fast rise has been attributed to a posh interaction of things, together with fast urbanization, way of life transitions, antagonistic early-life exposures, inhabitants getting older, and restricted entry to preventive and healing well being providers [2,6].
Although interventions have been launched on the world degree (e.g., World Health Organisation HEARTS technical Packages for hypertension and diabetes, Global noncommunicable illness (NCD)s greatest buys) [7,8], the regional degree (e.g., African Union’s strategic frameworks on NCDs) [9], the nationwide degree (e.g., integration of diabetes and hypertension care into main healthcare packages) [10], and the neighborhood degree (e.g., task-shifting to nurses and neighborhood well being staff) [11], the management of kind 2 diabetes and hypertension in scientific observe stays a serious problem. For occasion, a meta-analysis of 74 research in sub-Saharan Africa confirmed that solely 30% of sufferers with kind 2 diabetes obtain enough glucose management [12], and almost half of these handled for hypertension stay uncontrolled [13]. Complications are additionally widespread, with one in three sufferers (~35%) affected by diabetic eye illness, persistent kidney illness, stroke, or coronary heart failure [14]. This contrasts sharply with high-income nations, the place greater than 75% of sufferers obtain good kind 2 diabetes and hypertension management [15,16], and complication charges are under 10% [15].
One main issue for attaining management of kind 2 diabetes and hypertension is affected person adherence to the therapy [17–19]. The therapy for cardiometabolic ailments is long-term and sometimes lifelong and rests on three key pillars: (i) pharmacological remedy (glucose-, blood pressure-, and lipid-lowering remedy, usually together), (ii) way of life modification (dietary change, bodily exercise, weight administration, and discount of dangerous behaviors corresponding to smoking and extreme alcohol use), and (iii) self-monitoring and home-based care (monitoring blood glucose, blood stress, and weight, and adjusting behaviors or therapy when obligatory) [20,21]. Patients are due to this fact required to stick to all three pillars to realize higher illness management and forestall issues [20,21].
While adherence to all cardiometabolic illness therapy pillars is central to cardiometabolic illness management, particularly in sub-Saharan Africa the place prevalence is rising and management stays poor [1,2,12], region-wide knowledge stays scarce. To date, pooled estimates exist just for antihypertensive remedy adherence (~44%) [22]. However, there isn’t any pooled knowledge on adherence to kind 2 diabetes medicines, way of life recommendation, or self-monitoring practices, nor on adherence to the general therapy technique (complete self-care) within the area. Similarly, little is understood concerning the cross-cutting determinants that form adherence throughout all therapy pillars and that might function central targets for intervention research. This hole additionally extends to related subgroups outlined by rural versus city residence, intercourse, age, and geographic areas (East, West, Central, and Southern Africa).
To fill this huge hole and supply actionable proof for well being professionals and policymakers, we carried out a complete mapping of affected person adherence throughout remedy, way of life recommendation, and self-monitoring for kind 2 diabetes and hypertension in sub-Saharan Africa. We additionally aimed to supply pooled proof on adherence to all therapy pillars (i.e., total self-care, reported by research utilizing composite multi-domain adherence instruments). Additionally, we used an interactive community evaluation to determine cross-cutting determinants most constantly related to adherence throughout all three therapy pillars, which signify precedence candidates for future interventional research aimed toward bettering adherence.
This systematic assessment and meta-analysis was carried out in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020 pointers, and is reported in accordance with the PRISMA guideline (S1 Checklist). The examine protocol was prospectively registered within the International Prospective Register of Systematic Reviews (PROSPERO; registration quantity CRD42024626793).
We included authentic quantitative research carried out in sub-Saharan Africa that assessed adherence to no less than one of many three foremost therapy pillars of cardiometabolic illness in adults (≥18 years) identified with kind 2 diabetes, hypertension, or each. The three therapy pillars have been outlined as: (i) remedy adherence, referring to using prescribed antihypertensive or antidiabetic remedy; (ii) way of life adherence, together with dietary modification, enough bodily exercise, non-smoking, and avoidance of dangerous alcohol consumption; and (iii) self-monitoring adherence, referring to home-based monitoring of blood stress and/or blood glucose. Eligible examine designs have been observational (cross-sectional, cohort, or case–management), interventional, and mixed-methods research (the quantitative half solely). We excluded systematic evaluations, meta-analyses, case stories, qualitative research, and research with out related adherence outcomes. We restricted the search to publications in English between 1 January 2004 and 14 May 2026 to seize each earlier developments in adherence patterns throughout the fast rise of cardiometabolic ailments in Africa (2004–2014) and more moderen, policy-relevant proof from the previous decade (2015–2026 (May)).
We systematically searched six digital databases: PubMed, Embase, Cochrane Library, Web of Science, African Journals Online (AJOL), and CINAHL. To complement the peer-reviewed proof, we searched Google Scholar to seize research not but listed in main databases, as literature means that solely about one-quarter of sub-Saharan African biomedical journals are listed in worldwide databases [23,24]. In addition, the reference lists of all included research and related systematic evaluations have been hand-searched to determine additional eligible research. The search technique mixed managed vocabulary phrases (MeSH and Emtree) with free-text key phrases for kind 2 diabetes, hypertension, adherence, compliance, and sub-Saharan Africa. To guarantee complete protection, the names of all nations within the area have been included. Full digital search methods for every database are offered in S1 Appendix.
All retrieved data have been imported into Covidence (Veritas Health Innovation, Melbourne, Australia) for automated deduplication and screening. A pilot screening of the primary 20 articles was carried out by the search crew to standardize the extraction course of (RS, AS, AA, BM and FPC). Title and summary screening was carried out independently in reviewer pairs (RS and AS; AA and BM), adopted by full-text assessment of doubtless eligible articles. Disagreements at both stage have been resolved by way of dialogue throughout the reviewer pairs, and when consensus couldn’t be reached, they have been resolved in session with the senior reviewer (FPC). Reasons for exclusion on the full-text stage have been recorded intimately.
Data extraction was carried out in Covidence utilizing a standardized and piloted kind. Two reviewers from the assigned pairs independently extracted knowledge from every examine. Extracted variables included examine traits (writer, yr, nation, design, setting, and pattern dimension), participant traits (imply or median age and intercourse distribution), adherence measurement strategies (e.g., Morisky Medication Adherence Scale, Hill-Bone Compliance Scale, Summary of Diabetes Self-Care Activities scale), prevalence of adherence inside every therapy pillar (remedy, way of life, self-monitoring, and total self-care [i.e., adherence to all three pillars, extracted from studies that directly measured adherence across all three pillars combined using composite multi-domain adherence assessment tools]), and determinants of adherence (together with reported impact estimates corresponding to odds ratios, beta coefficients, hazard ratios, and correlation coefficients). Disagreements in knowledge extraction have been resolved by way of dialogue inside reviewer pairs, with unresolved points referred to the senior reviewer (FPC). For longitudinal cohort research and randomized managed trials, adherence prevalence was extracted from baseline measurements to make sure comparability with cross-sectional research, whereas impact estimates for determinants of adherence have been taken from follow-up, as that is when the impact of the determinant or intervention is captured by design and greatest displays the temporal or post-intervention affiliation.
For the included research, we carried out meta-analyses of adherence proportions utilizing random-effects logistic-normal generalized linear blended fashions (GLMM) in R (model 4.3.2) with the meta and metafor packages. Proportions have been pooled on the logit scale and back-transformed for interpretation. Between-study heterogeneity was quantified utilizing the I2 statistic, with 95% prediction intervals reported the place acceptable.
Subgroup analyses have been carried out by illness kind (kind 2 diabetes versus hypertension), therapy pillar (remedy, way of life, self-monitoring, total self-care), participant age (≥50 years versus < 50 years; cutoff knowledgeable by main getting older research in sub-Saharan Africa corresponding to WHO-SAGE and INDEPTH, the place the cutoff might keep in mind the area’s decrease life expectancy than in high-income settings) [25,26], proportion of ladies within the pattern (≥50% versus < 50%; distinguishing predominantly male versus feminine examine populations), examine setting (city, rural, or blended), geographic subregion (West, East, Central, Southern Africa), and examine interval (2004–2014 versus 2015–2026). To complement these descriptive comparisons, meta-regression was carried out utilizing the identical variables as study-level covariates. Age (steady, per 10 years), proportion of ladies (steady, per 10%), and examine interval (steady, per 10 years) have been modeled to retain statistical energy, whereas the remaining variables have been retained as categorical as they’re naturally categorical. Pooled estimates with 95% confidence intervals (CIs) have been introduced in forest plots.
The methodological high quality of included research was assessed by design. Cohort research have been evaluated utilizing the Newcastle–Ottawa Scale (NOS, most 9 stars), cross-sectional research with the NOS tailored for cross-sectional designs (most 10 stars) and randomized managed trials with the Cochrane Risk of Bias 2 (RoB 2) software. For the NOS, research have been categorised as low danger of bias (7–9 stars for cohort NOS; 7–10 stars for tailored NOS), reasonable danger (5–6 stars for each), or excessive danger (0–4 stars for each). RoB 2 assessments have been summarized as low danger, some considerations, or excessive danger of bias. Two reviewer groups (RS and AS; AA and BM) independently carried out all assessments, with disagreements resolved by consensus or the senior reviewer (FPC). Publication bias was assessed in R (model 4.3.2) utilizing the metafor bundle. Funnel plots have been visually inspected for asymmetry, and Egger’s regression check was utilized to statistically consider small-study results.
Sensitivity analyses have been carried out to check the robustness of the pooled adherence estimates by excluding research at excessive danger of bias and by proscribing analyses to those who used standardized, validated adherence instruments. Commonly used devices included the Morisky Medication Adherence Scale (MMAS-8), the Hill-Bone Compliance Scale, and the Summary of Diabetes Self-Care Activities (SDSCA). Details of the devices utilized in every examine, and whether or not a standardized software was utilized, are offered in S2 Appendix.
As a lot of determinants have been reported throughout research, we carried out an interactive community evaluation in R (model 4.3.2) to map and prioritize those who seem most constantly throughout research in the identical route, offering a structured overview of potential targets to tell the design of future interventional research aimed toward bettering adherence. The full workflow, together with knowledge processing and visualization code, is out there on GitHub (https://github.com/hannahchek/networkanalysis). Determinants and their impact estimates (odds ratios [ORs], relative dangers [RRs], prevalence ratios [PRs], hazard ratios [HRs], β coefficients, or correlation coefficients) have been extracted along with their linked outcomes, grouped into the three therapy pillars (remedy, way of life, self-monitoring) [27,28]. For HRs, we first approximated RRs utilizing the VanderWeele methodology incorporating the baseline occasion fee, after which transformed these RRs to ORs utilizing the Zhang and Yu components [27,29]. All impact measures have been transformed into ORs utilizing established strategies (e.g., Zhang and Yu for RRs, Chinn for correlations). For determinants reported as categorical variables with a number of ordered ranges (e.g., training with classes of none, main, secondary, tertiary), we extracted the OR evaluating the best versus the bottom reported class (e.g., tertiary versus no training) to seize the utmost distinction and guarantee consistency throughout research. A harmonized dataset was then created that retained for every determinant the OR, comparability, route of impact, and related consequence.
To information interpretation, we developed a composite Noteworthiness Score that ranked determinant–consequence associations by combining two parts: absolutely the magnitude of the impact dimension and the variety of research supporting the affiliation (https://github.com/hannahchek/networkanalysis). Each part was transformed into percentile ranks after which blended, with a weighting of 60% for impact dimension and 40% for examine rely (Noteworthiness = 0.6 × rank(|log(OR)|) + 0.4 × rank(n)). This steadiness was chosen after testing a number of options (e.g., 50/50, 70/30, and 80/20): equal weighting tended to reward incessantly reported however weak results, whereas increased weighting for impact dimension overemphasized massive however much less replicated associations. The 60/40 scheme minimized each dangers, produced steady rankings below sensitivity checks, and ensured that associations have been prioritized once they have been each robust and constantly replicated. Scores ranged from 0.06 to 0.85. To interpret the rankings, we inspected the distribution of Noteworthiness Scores and recognized a decent upper-tail cluster of associations (scores 0.775–0.850) separated from the descending tail by the biggest hole within the higher distribution (rank 5–6, Δ = 0.025). This cluster fell throughout the prime 5% of the distribution, and scores on this area have been due to this fact interpreted as probably the most influential throughout the community.
During the preparation of this work, the authors used Claude (Anthropic) for language modifying. It was not used to generate knowledge, carry out analyses, or draw conclusions. All output was reviewed and verified by the authors, who take full duty for the ultimate manuscript.
The search recognized 6,945 data (6,914 from educational databases and 41 from Google Scholar). After eradicating 1,406 duplicates, 5,549 data have been screened, and 5,020 have been excluded at title/summary stage. Of 529 full texts assessed, 217 have been excluded in whole. Reasons have been; fallacious outcomes (100), fallacious inhabitants (75), no full textual content (30), non-English (4), retracted (3), fallacious setting (2) and non-comparable (3). A complete of 312 research met eligibility standards and have been included within the assessment (Fig 1).
Fig 1. PRISMA 2020 flow diagram of study selection for the systematic review and meta-analysis of adherence to medication, lifestyle advice, and self-monitoring for type 2 diabetes and hypertension in sub-Saharan Africa.
The flow diagram illustrates the identification, screening, eligibility assessment, and inclusion of studies. The number of records identified from each information source is shown, including six academic databases (PubMed, Embase, Web of Science, Cochrane Library, CINAHL [Cumulative Index to Nursing and Allied Health Literature], and AJOL [African Journals Online]) and a Google Scholar search engine query, followed by duplicates removed before screening, records excluded at title and abstract screening, full-text articles assessed for eligibility, full-text exclusions with reasons, and the final number of studies included in the review. n, number of records or studies; PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses.
The 312 included research comprised 108,014 individuals throughout 28 sub-Saharan African nations, with Ethiopia (44.6%) and Nigeria (19.6%) contributing the biggest share, adopted by Ghana (8.3%) and South Africa (8.0%; Table 1; S2 Appendix). Most research have been printed in or after 2014 (91.3%) and have been predominantly cross-sectional (88.7%), with fewer cohort (3.5%), randomized managed trial (2.3%), case–management (1.3%), quasi-experimental (2.9%), and mixed-methods (3.5%, quantitative half solely extracted) designs. Nearly half have been carried out in city settings (46.5%), 44.6% in blended city–rural populations, and 9.0% in rural settings. Sample sizes ranged from 24 to 2,870, the pooled imply participant age was 55.6 years (with medians handled as means the place obligatory), and the imply feminine proportion throughout research was 57.2%.
Pooled adherence was 67% (95% CI [60, 73], I2 = 99%, p < 0.001) for anti-diabetic remedy and 51% (95% CI [44, 58], I2 = 99%, p < 0.001) for antihypertensive remedy. Lifestyle adherence was decrease total, with 44% (95% CI [38, 49], I2 = 98%, p < 0.001) for dietary suggestions and 42% (95% CI [37, 47], I2 = 98%, p < 0.001) for bodily exercise, although adherence was increased for alcohol use suggestions at 85% (95% CI [82, 88], I2 = 98%, p < 0.001) and for tobacco abstinence at 95% (95% CI [94, 96], I2 = 96%, p < 0.001). Self-monitoring adherence was poorest, at 18% (95% CI [12, 27], I2 = 99%, p < 0.001) for blood glucose and 28% (95% CI [16, 45], I2 = 98%, p < 0.001) for blood stress. Overall self-care adherence, as immediately assessed in research utilizing composite multi-domain adherence instruments, was 37% (95% CI [30, 46], I2 = 99%, p < 0.001) amongst sufferers with kind 2 diabetes and 35% (95% CI [29, 42], I2 = 98%, p < 0.001) amongst these with hypertension (Fig 2, S3 Appendix).
Fig 2. Pooled adherence proportions across treatment pillars for type 2 diabetes and hypertension in sub-Saharan Africa.
Bar chart showing pooled adherence proportions (%) with 95% confidence intervals (error bars) across the three treatment pillars and for overall self-care adherence. The medication adherence panel shows anti-diabetic and anti-hypertensive medication adherence; the lifestyle guidance panel shows adherence to dietary recommendations, physical activity, alcohol abstinence, and smoking cessation; the self-monitoring panel shows adherence to blood glucose and blood pressure self-monitoring; and the overall self-care panel shows pooled adherence across all three pillars combined, separately for diabetes and hypertension. Pooled estimates were derived from random-effects logistic-normal generalized linear mixed models (GLMM) using the logit transformation. I2, heterogeneity statistic representing the percentage of variation attributable to between-study heterogeneity; k, number of studies contributing to the pooled estimate; N, total number of participants contributing to the pooled estimate; p, p-value for heterogeneity from Cochran’s Q test.
We report subgroup analyses summaries in Appendices 4–7 and the forest plots in S8 Appendix. In distinction, antihypertensive adherence was increased in youthful than in older populations, in female-majority than in male-majority examine populations, in city than in rural settings, and in East Africa (vs. West and Central/Southern Africa). Adherence was comparable in more moderen research (2015–2026) and earlier research (2004–2014, S4 and S8 Appendices). Meta-regression with age (steady, per 10 years), proportion of ladies (steady, per 10%), and examine interval (steady, per 10 years) confirmed the identical directional patterns however didn’t affirm them as statistically important (Table 2).
For way of life, adherence to food regimen and bodily exercise suggestions was low throughout all teams and considerably decrease in rural than city populations, whereas adherence to alcohol and tobacco suggestions was constantly excessive, notably in older adults, girls, and rural populations (S5 and S8 Appendices). Meta-regression confirmed that increased imply participant age and the next proportion of feminine individuals have been positively related to adherence to each alcohol and tobacco suggestions, and that adherence to tobacco suggestions was decrease in Southern/Central Africa than in East Africa (Table 2).
For self-monitoring, adherence was poor total (S6 and S8 Appendices). Blood glucose monitoring was decrease in female-majority examine populations and in Central/Southern Africa, whereas blood stress monitoring was increased in older, female-majority, and concrete populations. Meta-regression confirmed that adherence to blood glucose monitoring elevated with later examine interval however was decrease with the next proportion of feminine individuals and decrease in Southern/Central Africa than in East Africa, whereas adherence to blood stress monitoring was increased in West Africa than in East Africa (Table 2).
For total self-care, adherence amongst individuals with kind 2 diabetes various considerably throughout subgroups, being increased in older adults, in male-majority examine populations, in East Africa (vs. Central/Southern Africa), and in more moderen research (S7 and S8 Appendices). In distinction, adherence amongst individuals with hypertension was decrease in older adults, in female-majority examine populations, and in Central/Southern Africa (vs. East and West Africa). Meta-regression confirmed that total self-care adherence in kind 2 diabetes was decrease with the next proportion of feminine individuals and decrease in Southern/Central Africa than in East Africa, whereas no examine attribute was considerably related to total self-care adherence in hypertension (Table 2).
Sensitivity analyses confirmed that the principle findings have been strong. Excluding research at excessive danger of bias didn’t materially alter the pooled estimates (S9 and S10 Appendices). Medication adherence was 64% (95% CI [55, 73], I2 = 99%, p < 0.001) for anti-diabetic remedy and 49% (95% CI [40, 58], I2 = 99%, p < 0.001) for antihypertensive remedy. Lifestyle adherence was 47% (95% CI [41, 53], I2 = 98%, p < 0.001) for food regimen suggestions and 42% (95% CI [36, 47], I2 = 98%, p < 0.001) for bodily exercise, whereas remaining excessive at 85% (95% CI [81, 89], I2 = 98%, p < 0.001) for alcohol and 94% (95% CI [93, 96], I2 = 96%, p < 0.001) for tobacco suggestions. Self-monitoring adherence was 19% (95% CI [11, 29], I2 = 99%, p < 0.001) for blood glucose and 20% (95% CI [12, 32], I2 = 97%, p < 0.001) for blood stress. Overall self-care adherence was 40% (95% CI [32, 48], I2 = 98%, p < 0.001) for kind 2 diabetes and 35% (95% CI [28, 41], I2 = 97%, p < 0.001) for hypertension.
Restricting analyses to research utilizing standardized adherence instruments (i.e., excluding sure/no adherence assessments) yielded comparable outcomes (S11 and S12 Appendices). Medication adherence was 60% (95% CI [52, 67], I2 = 99%, p < 0.001) for anti-diabetic remedy and 46% (95% CI [37, 56], I2 = 99%, p < 0.001) for antihypertensive remedy. Lifestyle adherence was 44% (95% CI [34, 54], I2 = 99%, p < 0.001) for food regimen suggestions and 42% (95% CI [36, 49], I2 = 98%, p < 0.001) for bodily exercise, whereas remaining excessive at 86% (95% CI [76, 92], I2 = 99%, p < 0.001) for alcohol suggestions (no research utilizing validated instruments reported on tobacco use). Self-monitoring adherence was 26% (95% CI [16, 40], I2 = 98%, p < 0.001) for blood glucose (no research utilizing validated instruments reported on blood stress self-monitoring). Overall self-care adherence was 36% (95% CI [28, 46], I2 = 99%, p < 0.001) for kind 2 diabetes and 36% (95% CI [29, 43], I2 = 98%, p < 0.001) for hypertension.
Given the big variety of determinants reported throughout the included research, we used the interactive community evaluation to determine those who seem most constantly throughout research in the identical route, pointing to precedence candidates for future interventional research. A complete of 169 determinant–consequence associations have been included into the evaluation. Cross-cutting determinants most constantly related to adherence throughout a number of therapy pillars have been recognized throughout the prime fifth percentile of all Noteworthiness Scores (NS; roughly 0.70), primarily based on the rating distribution and clustering noticed within the rank plot. Lack of formal training constantly lowered adherence to food regimen suggestions, bodily exercise, and blood glucose monitoring (NS = 0.82–0.83). Positive determinants included good illness information (NS = 0.79), excessive self-efficacy (NS = 0.78), and a constructive angle towards therapy (NS = 0.83). Being married improved dietary suggestion adherence (NS = 0.81), whereas membership in a diabetic affiliation promoted anti-diabetic remedy adherence (NS = 0.74). Negative experiences, corresponding to unwanted effects, forgetfulness, and stopping remedy when asymptomatic, additionally scored above 0.70, indicating substantial antagonistic results. An interactive 3D model of the community graph will be accessed on our on-line GitHub platform (https://hannahchek.github.io/networkanalysis/). A pattern of the community map is offered in Fig 3.
Fig 3. Snapshot of the interactive network graph mapping determinants of adherence across treatment pillars for type 2 diabetes and hypertension in sub-Saharan Africa.
Two-dimensional snapshot of the interactive network graph showing the relationships between determinants of adherence and adherence outcomes across the three treatment pillars (medication, lifestyle, self-monitoring) for type 2 diabetes and hypertension. Yellow nodes represent adherence outcomes (e.g., adherence to anti-hypertensive medication, anti-diabetic medication, diet recommendations, blood glucose self-monitoring, non-alcohol consumption, non-smoking, and overall self-care). Blue nodes represent determinants of adherence, expressed as categorical contrasts (e.g., “No Formal Education vs. Formal Education”). Edges connecting nodes show the direction of association between each determinant and outcome: purple edges represent positive associations and orange edges represent negative associations, with edge labels showing the corresponding odds ratio. The full interactive three-dimensional version of the network, including all 169 determinant–outcome associations and Noteworthiness Scores, is available at https://hannahchek.github.io/networkanalysis/. BP, blood stress; OR, odds ratio; vs, versus.
Observational research have been typically of top of the range, with 86% rated as low or reasonable danger, offering a strong real-world proof base (S13 and S14 Appendices). In distinction, the eight randomized managed trials have been weaker, with 4 rated excessive danger, three elevating some considerations, and just one rated low danger, underscoring the comparatively restricted energy of experimental proof (S13 and S14 Appendices).
Publication bias was assessed utilizing funnel plots and Egger’s regression check (S15 and S16 Appendices). Several outcomes confirmed no important small-study results, together with anti-hypertensive remedy (p = 0.273), dietary steerage (p = 0.070), bodily exercise steerage (p = 0.070), blood stress self-monitoring (p = 0.818), and total hypertension self-care (p = 0.097), suggesting minimal danger of publication bias for these domains. However, funnel-plot asymmetry was detected for anti-diabetic remedy (p = 0.002), alcohol steerage (p < 0.001), smoking steerage (p < 0.001), blood glucose self-monitoring (p < 0.001), and total diabetes self-care (p = 0.014), indicating attainable small-study results. Sensitivity analyses excluding high-risk-of-bias research and proscribing to standardized measurement instruments confirmed that pooled estimates for the main pillars of adherence (remedy, food regimen, and self-monitoring) remained steady, suggesting that publication bias is unlikely to have materially influenced the principle conclusions.
Heterogeneity was constantly excessive throughout pooled analyses and endured after subgroup and sensitivity analyses. This possible displays real variation in adherence patterns associated to variations in populations, measurement instruments, and well being system contexts throughout sub-Saharan Africa, somewhat than methodological flaws.
We present a complete mapping of adherence to therapy for kind 2 diabetes and hypertension in sub-Saharan Africa throughout the three key therapy pillars of medicines, way of life behaviors, and self-monitoring, and recognized cross-cutting determinants as precedence candidates for future interventional research. Overall adherence to complete self-care (all three pillars assessed utilizing composite multi-domain instruments) was very low. Medication adherence was barely increased for kind 2 diabetes than hypertension however suboptimal for each. Adherence to food regimen and bodily exercise was poor, whereas adherence to alcohol and smoking suggestions was excessive, and self-monitoring was the weakest pillar. Subgroup and meta-regression analyses revealed various patterns throughout pillars by age, intercourse, residence, geography, and examine interval. Education, self-efficacy, and social assist emerged as cross-cutting determinants most constantly related to adherence throughout domains.
Type 2 diabetes and hypertension require sustained adherence throughout key therapy pillars: medicines, way of life modification, and self-monitoring to realize sturdy management and avert issues [20,21]. In sub-Saharan Africa, nonetheless, proof has been fragmented, largely restricted to single pillars corresponding to antihypertensive medicines [22], with little synthesis throughout the others or consideration to shared determinants. By pooling knowledge from greater than 100,000 individuals throughout 28 nations, this examine gives a complete mapping of adherence inside every pillar and throughout all pillars collectively, and identifies cross-cutting determinants as precedence candidates for future interventional research.
We discovered that pooled adherence proportions to medicines have been 67% for kind 2 diabetes and 51% for hypertension. These ranges are suboptimal in comparison with high-income nations, the place adherence is mostly above 70% [27,28], however mirror different low- and middle-income nations, the place adherence to remedy is normally round half of the studied populations [29,30]. The hypertension pooled proportions of 51% are additionally near the earlier meta-analysis in sub-Saharan Africa (from inception to 2023) that reported pooled proportions of 44% [22]. The increased adherence noticed for kind 2 diabetes in contrast with hypertension could also be partly defined by the symptomatic nature of hyperglycemia, which reinforces therapy continuation, whereas hypertension stays largely asymptomatic and will doubtlessly be deprioritised by sufferers [31,32]. Within the remedy pillar, entry to remedy and different medication-related elements corresponding to drug stock-outs, out-of-pocket prices, polypharmacy, unwanted effects might play a extra particular function [33–36]. For instance, surveys in Ghana and Nigeria report that as much as half of sufferers discontinue remedy as a consequence of affordability [33], whereas facility audits in Ethiopia and Uganda present that important cardiometabolic illness medicines are unavailable as much as 40% of the time [34,35].
We discovered that adherence to way of life suggestions was low for food regimen (44%) and bodily exercise (42%) suggestions however excessive for alcohol (85%) and smoking (95%) suggestions. This distinction might replicate variations in behavioral demand: abstaining from alcohol and tobacco usually aligns with prevailing social or spiritual norms [37,38]. More than 80% of adults in sub-Saharan Africa report faith as central to every day life [39], with massive Muslim and Christian populations putting express restrictions on alcohol and tobacco use [39]. By distinction, food regimen and bodily exercise require sustained behavioral change [40]. Dietary modification might require meals which might be much less inexpensive, much less most popular by households, or incompatible with native cooking practices [41], whereas growing bodily exercise usually requires disrupting established routines [41]. Factors corresponding to faith and the calls for of sustained behavioral change might assist clarify why adherence to food regimen and bodily exercise stays decrease than for alcohol and smoking [41].
We discovered that self-monitoring was the weakest pillar, with adherence at 18% for blood glucose and 28% for blood stress. In high-income nations, greater than 70% of sufferers with kind 2 diabetes carry out common glucose and blood stress monitoring at residence [42,43]. The notably low ranges in sub-Saharan Africa could also be partly because of the excessive prices of gadgets and strips, absence of reimbursement, restricted affected person training, and weak integration of self-monitoring into main care [44,45]. Surveys in Kenya and Tanzania point out that fewer than one in 5 sufferers with diabetes can afford glucose strips on a month-to-month foundation, whereas residence blood stress screens stay largely hospital-based [46–48]. Without such instruments, sufferers and suppliers lack the suggestions wanted to regulate remedy in actual time, which can contribute to poor illness management and preventable issues.
When all three pillars have been thought of collectively (i.e., all three pillars assessed utilizing composite multi-domain instruments), we discovered that complete self-care was achieved by solely 37% of sufferers with kind 2 diabetes and 35% with hypertension. These figures are strikingly low, given the sharp rise in cardiometabolic illness burden and the enlargement of nationwide and regional NCD programmes [49]. In high-income nations, adherence to complete self-care usually exceeds 70% [50,51]. The a lot decrease ranges in sub-Saharan Africa might partly replicate well being methods nonetheless oriented towards acute care [52], restricted integration of persistent NCD administration into main care [53], and inadequate continuity of care and monetary safety [54].
Subgroup and meta-regression analyses confirmed that adherence patterns various throughout pillars and inhabitants teams. Antihypertensive remedy adherence was increased in youthful adults, girls, city residents, and East Africa; adherence to alcohol and tobacco suggestions was increased in older adults, girls, and rural populations; dietary adherence was increased in city populations; and total hypertension self-care was increased in youthful adults, males, and East Africa. These subgroup variations in adherence might replicate each well being system and contextual elements. For instance, girls’s extra frequent contact with well being providers, notably by way of reproductive and baby healthcare, can construct familiarity with persistent care routines [55]. Younger adults might have better well being literacy, digital entry, and fewer comorbidities, supporting adherence to food regimen, train, and monitoring suggestions [56]. Urban residents profit from shorter journey distances, steadier drug provide, stronger diagnostic capability, and better availability of supportive environments for wholesome dwelling, whereas rural populations face lengthy journey occasions, restricted suppliers, increased prices, and extra frequent stock-outs [57]. Regional variation might replicate variations in well being system funding and NCD programme maturity [53,58].
While adherence is affected by a variety of particular person, social, and system-level elements, these can not realistically be addressed one after the other. Identifying determinants that seem most constantly throughout research and affect a number of pillars (cross-cutting determinants) presents a extra environment friendly technique with potential for broader impression. In this examine, training, self-efficacy, and social assist emerged as cross-cutting elements most constantly related to adherence throughout medicines, way of life behaviors, and self-monitoring. This sample factors to those determinants as precedence candidates for future interventional research, which might check whether or not focusing on them delivers multi-pillar advantages. In sub-Saharan Africa, the place well being literacy stays low and structured affected person training is restricted, such determinants could also be much more decisive [59]. Future interventions research strengthening affected person information, constructing confidence in illness self-management, and shifting therapy perceptions might due to this fact signify among the promising instructions levers for bettering adherence on this area.
Our findings have essential implications for coverage and scientific observe. The rising burden of kind 2 diabetes and hypertension in sub-Saharan Africa, amidst persistently poor management charges, underscores an pressing hole: affected person adherence to therapy has not but been given adequate emphasis inside regional insurance policies or scientific pointers [19,60]. Our examine demonstrates that adherence is suboptimal throughout and inside all three key therapy pillars (remedy, way of life recommendation, self-monitoring), and that there isn’t any clear proof of enchancment over latest a long time within the area. These findings demand pressing and deliberate motion from policymakers (WHO, Africa Centres for Disease Control and Prevention, nationwide governments), guideline committees and scientific leaders to raise adherence as a central pillar in cardiometabolic illness management methods—as a result of with out considerably improved adherence, the potential of remedies, way of life interventions and monitoring can’t be realized. We determine cross-cutting determinants, specifically training, self-efficacy, and social assist, as precedence targets for future interventional research aimed toward bettering adherence throughout all three pillars. These ought to kind the muse of future adherence-enhancement methods. Simultaneously, pillar-specific methods (e.g., technological improvements corresponding to digital self-monitoring instruments, simplified fixed-dose remedy regimens, community-based way of life programmes) needs to be evaluated to enrich these foundational levers.
Moreover, our subgroup findings spotlight essential fairness and focusing on issues: older adults, males, rural populations, and people in Central and Southern African areas exhibit constantly decrease adherence ranges. This alerts the necessity for future focused coverage designs and useful resource allocation to deprived populations and geographies.
This examine has each strengths and limitations. Its key strengths are its scale, a synthesis of adherence to therapy for kind 2 diabetes and hypertension in sub-Saharan Africa, and its scope, encompassing all three therapy pillars and greater than 100,000 individuals from 28 nations. The integration of subgroup and meta-regression analyses allow identification of teams which might be extra affected than others, together with males, older sufferers and rural populations. The use of a 3D community evaluation allowed identification of cross-cutting determinants most constantly related to adherence throughout a number of pillars, offering precedence candidates for future interventional research. Limitations needs to be thought of in decoding the findings. First, adherence was primarily assessed by way of self-report, which can overestimate true ranges. Second, heterogeneity throughout research was substantial (I2 > 95%) and was addressed utilizing random-effects fashions, that are designed for such variability, with prediction intervals reported the place acceptable. Extensive efforts to determine the sources of heterogeneity, together with subgroup analyses, meta-regressions, sensitivity analyses restricted to research at low danger of bias, and sensitivity analyses restricted to research utilizing standardized adherence instruments, didn’t determine a transparent supply, suggesting that this displays real variation in adherence throughout populations, measurement instruments, and well being system contexts in sub-Saharan Africa somewhat than methodological flaws. The pooled estimates ought to due to this fact be interpreted as central abstract measures of adherence within the area, with the subgroup and sensitivity analyses offering the context for understanding the variation round them. Third, geographic protection was uneven, with Ethiopia and Nigeria contributing disproportionately and Central Africa and Southern Africa much less represented; nonetheless, regional analyses didn’t present marked variations, supporting robustness of the general conclusions. Fourth, nearly all of included research have been cross-sectional, which precludes causal inference for the determinants of adherence. The cross-cutting determinants recognized within the community evaluation ought to due to this fact be interpreted as precedence candidates for future interventional research somewhat than as established causal targets. Lastly, given the affordable variety of research contributing to every meta-regression mannequin, non-significant findings possible replicate likelihood variation round a null impact, and needs to be interpreted with warning as they might not be reproducible in impartial research.
Adherence throughout all therapy pillars for kind 2 diabetes and hypertension stays markedly suboptimal in sub-Saharan Africa, with fewer than half of sufferers attaining complete self-care. Within particular person pillars, adherence is lowest for food regimen, bodily exercise, and self-monitoring, whereas adherence to alcohol and tobacco suggestions is relatively excessive. Subgroup analyses revealed increased adherence amongst girls, youthful adults, city residents, and populations in East Africa, with no proof of enchancment over the previous decade. Education, self-efficacy, and social assist emerged as cross-cutting determinants most constantly related to adherence throughout a number of pillars, and signify precedence candidates for future interventional research aimed toward bettering adherence within the area.
Documents the systematic search across six databases (PubMed, Embase, Cochrane Library, Web of Science, AJOL, CINAHL) plus Google Scholar gray literature, restricted to English-language publications from January 2004 to May 2026. Search terms were structured around four domains: diseases (type 2 diabetes, hypertension), adherence behaviors, determinants, and geography (sub-Saharan Africa), combined with Boolean operators. The full PubMed search string is reproduced to enable replication.
https://doi.org/10.1371/journal.pmed.1005189.s001
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Master extraction table for all 312 included studies, recording country, residence setting, year, design, duration, population, sample size, age and sex distribution, adherence outcomes with their operational definitions, and the determinants of adherence examined. Provided as a separate spreadsheet because of its size.
https://doi.org/10.1371/journal.pmed.1005189.s002
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Random-effects meta analyses of the prevalence of adherence to anti-diabetic medications, anti-hypertensive medications, dietary guidance, physical activity guidance, alcohol guidance, smoking guidance, blood glucose self-monitoring, blood pressure self-monitoring, overall diabetes self-care, and overall hypertension self-care. Each plot shows individual study estimates with 95% confidence intervals and the pooled diamond, with I2 and τ2 summarizing between-study heterogeneity. Heterogeneity p values, where shown, are from Cochran’s Q test.
https://doi.org/10.1371/journal.pmed.1005189.s003
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Pooled adherence to anti diabetic and anti-hypertensive medications stratified by mean age (under 50 versus 50 years and above), proportion of female participants (under 50% versus 50% and above), residence (urban, rural, or mixed), geographical region within sub-Saharan Africa, and publication period. Tests whether medication adherence varies systematically across patient and contextual subgroups. Differences across subgroups were tested using random-effects meta-regression (GLMM; Wald test).
https://doi.org/10.1371/journal.pmed.1005189.s004
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Pooled adherence to dietary, physical activity, alcohol, and smoking guidance stratified by the same five moderators as S4 Appendix. Identifies inhabitants and context traits that designate variation in way of life adherence. Differences throughout subgroups have been examined utilizing random-effects meta-regression (GLMM; Wald check).
https://doi.org/10.1371/journal.pmed.1005189.s005
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Pooled adherence to blood glucose and blood pressure self-monitoring stratified by the same five moderators. Highlights where home self-monitoring is more or less common. Differences across subgroups were tested using random-effects meta-regression (GLMM; Wald test).
https://doi.org/10.1371/journal.pmed.1005189.s006
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Pooled composite diabetes and hypertension self-care adherence stratified by the same five moderators. Shows which subgroups demonstrate stronger overall self-care. Differences across subgroups were tested using random-effects meta-regression (GLMM; Wald test).
https://doi.org/10.1371/journal.pmed.1005189.s007
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Companion figures to Appendices 4–7. For every adherence outcome, studies are stratified by age, sex distribution, residence, geographical region, and publication period. Visualizes the subgroup pooled estimates so heterogeneity between subgroups can be inspected directly. Heterogeneity p values, where shown, are from Cochran’s Q test.
https://doi.org/10.1371/journal.pmed.1005189.s008
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Pooled adherence re estimated for each of the 10 outcomes using only studies rated low risk on the Newcastle–Ottawa Scale (7 stars or more) or Cochrane RoB 2. Tests whether the main pooled estimates are robust to exclusion of higher risk studies.
https://doi.org/10.1371/journal.pmed.1005189.s009
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Study level forest plots for each adherence outcome restricted to studies at low risk of bias. Lets readers see how pooled estimates and between-study spread change when only the most rigorous studies are pooled.
https://doi.org/10.1371/journal.pmed.1005189.s010
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Pooled adherence re-estimated using only studies that measured adherence with a validated instrument such as MMAS 4 or MMAS 8, Hill Bone, SDSCA, H SCALE, PDAQ, IPAQ, or GPAQ. Tests whether measurement tool quality changes the conclusions.
https://doi.org/10.1371/journal.pmed.1005189.s011
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Study level forest plots for the adherence outcomes with sufficient validated tool studies. Blood pressure self-monitoring is omitted because too few studies used a validated instrument. Shows how pooled estimates shift when only studies with validated measurement are included.
https://doi.org/10.1371/journal.pmed.1005189.s012
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Line-by-line consensus ratings for all 312 studies: Newcastle–Ottawa Scale star score and category for observational studies and Cochrane RoB 2 overall judgement for randomized controlled trials. Allows the quality rating of any individual study to be audited. Provided as a separate file.
https://doi.org/10.1371/journal.pmed.1005189.s013
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Cross tabulations of NOS judgements (low 7 stars or more, moderate 5–6 stars, high 4 stars or fewer) for observational studies and Cochrane RoB 2 judgements (low, some concerns, high) for randomized controlled trials, broken down by adherence outcome. Summarizes the overall methodological quality of the evidence base.
https://doi.org/10.1371/journal.pmed.1005189.s014
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For each of the 10 adherence outcomes, reports the pooled estimate alongside Egger’s t statistic, degrees of freedom, and p value. Provides a quantitative screen for funnel plot asymmetry and small study effects.
https://doi.org/10.1371/journal.pmed.1005189.s015
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Funnel plots paired with the Egger’s test results in S15 Appendix, one per adherence consequence. Each plot reveals examine adherence (logit scale) in opposition to commonplace error, with the pooled estimate and 95% pseudo confidence area overlaid. Asymmetry suggesting attainable publication bias was noticed for anti-diabetic medicines, alcohol, smoking, blood glucose self-monitoring, and total diabetes self-care. Other outcomes confirmed no important asymmetry (Egger’s regression check).
https://doi.org/10.1371/journal.pmed.1005189.s016
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