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Keene CM, Euvrard J, Amico KR, Ragunathan A, English M, McKnight J, Orrell C. Conceptualising engagement with HIV care for people on treatment: the Indicators of HIV Care and AntiRetroviral Engagement (InCARE) Framework. BMC Health Serv Res 2023; 23:435. [PMID: 37143067 PMCID: PMC10161576 DOI: 10.1186/s12913-023-09433-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 04/14/2023] [Indexed: 05/06/2023] Open
Abstract
BACKGROUND As the crisis-based approach to HIV care evolves to chronic disease management, supporting ongoing engagement with HIV care is increasingly important to achieve long-term treatment success. However, 'engagement' is a complex concept and ambiguous definitions limit its evaluation. To guide engagement evaluation and development of interventions to improve HIV outcomes, we sought to identify critical, measurable dimensions of engagement with HIV care for people on treatment from a health service-delivery perspective. METHODS We used a pragmatic, iterative approach to develop a framework, combining insights from researcher experience, a narrative literature review, framework mapping, expert stakeholder input and a formal scoping review of engagement measures. These inputs helped to refine the inclusion and definition of important elements of engagement behaviour that could be evaluated by the health system. RESULTS The final framework presents engagement with HIV care as a dynamic behaviour that people practice rather than an individual characteristic or permanent state, so that people can be variably engaged at different points in their treatment journey. Engagement with HIV care for those on treatment is represented by three measurable dimensions: 'retention' (interaction with health services), 'adherence' (pill-taking behaviour), and 'active self-management' (ownership and self-management of care). Engagement is the product of wider contextual, health system and personal factors, and engagement in all dimensions facilitates successful treatment outcomes, such as virologic suppression and good health. While retention and adherence together may lead to treatment success at a particular point, this framework hypothesises that active self-management sustains treatment success over time. Thus, evaluation of all three core dimensions is crucial to realise the individual, societal and public health benefits of antiretroviral treatment programmes. CONCLUSIONS This framework distils a complex concept into three core, measurable dimensions critical for the maintenance of engagement. It characterises elements that the system might assess to evaluate engagement more comprehensively at individual and programmatic levels, and suggests that active self-management is an important consideration to support lifelong optimal engagement. This framework could be helpful in practice to guide the development of more nuanced interventions that improve long-term treatment success and help maintain momentum in controlling a changing epidemic.
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Affiliation(s)
- Claire M Keene
- Oxford Centre for Global Health Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK.
| | - Jonathan Euvrard
- Centre for Infectious Disease Epidemiology and Research, School of Public Health and Family Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - K Rivet Amico
- Health Behaviour and Health Education, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Ayesha Ragunathan
- Oxford Centre for Global Health Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Mike English
- Oxford Centre for Global Health Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Jacob McKnight
- Oxford Centre for Global Health Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Catherine Orrell
- Department of Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
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Keene CM, Ragunathan A, Euvrard J, English M, McKnight J, Orrell C. Measuring patient engagement with HIV care in sub-Saharan Africa: a scoping study. J Int AIDS Soc 2022; 25:e26025. [PMID: 36285618 PMCID: PMC9597383 DOI: 10.1002/jia2.26025] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 09/27/2022] [Indexed: 11/05/2022] Open
Abstract
INTRODUCTION Engagement with HIV care is a multi-dimensional, dynamic process, critical to maintaining successful treatment outcomes. However, measures of engagement are not standardized nor comprehensive. This undermines our understanding of the scope of challenges with engagement and whether interventions have an impact, complicating patient and programme-level decision-making. This study identified and characterized measures of engagement to support more consistent and comprehensive evaluation. METHODS We conducted a scoping study to systematically categorize measures the health system could use to evaluate engagement with HIV care for those on antiretroviral treatment. Key terms were used to search literature databases (Embase, PsychINFO, Ovid Global-Health, PubMed, Scopus, CINAHL, Cochrane and the World Health Organization Index Medicus), Google Scholar and stakeholder-identified manuscripts, ultimately including English evidence published from sub-Saharan Africa from 2014 to 2021. Measures were extracted, organized, then reviewed with key stakeholders. RESULTS AND DISCUSSION We screened 14,885 titles/abstracts, included 118 full-texts and identified 110 measures of engagement, categorized into three engagement dimensions ("retention," "adherence" and "active self-management"), a combination category ("multi-dimensional engagement") and "treatment outcomes" category (e.g. viral load as an end-result reflecting that engagement occurred). Retention reflected status in care, continuity of attendance and visit timing. Adherence was assessed by a variety of measures categorized into primary (prescription not filled) and secondary measures (medication not taken as directed). Active self-management reflected involvement in care and self-management. Three overarching use cases were identified: research to make recommendations, routine monitoring for quality improvement and strategic decision-making and assessment of individual patients. CONCLUSIONS Heterogeneity in conceptualizing engagement with HIV care is reflected by the broad range of measures identified and the lack of consensus on "gold-standard" indicators. This review organized metrics into five categories based on the dimensions of engagement; further work could identify a standardized, minimum set of measures useful for comprehensive evaluation of engagement for different use cases. In the interim, measurement of engagement could be advanced through the assessment of multiple categories for a more thorough evaluation, conducting sensitivity analyses with commonly used measures for more comparable outputs and using longitudinal measures to evaluate engagement patterns. This could improve research, programme evaluation and nuanced assessment of individual patient engagement in HIV care.
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Affiliation(s)
- Claire M. Keene
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Ayesha Ragunathan
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Jonathan Euvrard
- Centre for Infectious Disease Epidemiology and ResearchSchool of Public Health and Family MedicineFaculty of Health SciencesUniversity of Cape TownCape TownSouth Africa
| | - Mike English
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Jacob McKnight
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Catherine Orrell
- Department of MedicineFaculty of Health SciencesUniversity of Cape TownCape TownSouth Africa
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Keene CM, Ragunathan A, Euvrard J, English M, McKnight J, Orrell C. Measuring patient engagement with HIV care in sub-Saharan Africa: a scoping study. J Int AIDS Soc 2022; 25:e26025. [PMID: 36285618 PMCID: PMC9597383 DOI: 10.1002/jia2.26025/full|10.1002/jia2.26025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 09/27/2022] [Indexed: 05/22/2023] Open
Abstract
INTRODUCTION Engagement with HIV care is a multi-dimensional, dynamic process, critical to maintaining successful treatment outcomes. However, measures of engagement are not standardized nor comprehensive. This undermines our understanding of the scope of challenges with engagement and whether interventions have an impact, complicating patient and programme-level decision-making. This study identified and characterized measures of engagement to support more consistent and comprehensive evaluation. METHODS We conducted a scoping study to systematically categorize measures the health system could use to evaluate engagement with HIV care for those on antiretroviral treatment. Key terms were used to search literature databases (Embase, PsychINFO, Ovid Global-Health, PubMed, Scopus, CINAHL, Cochrane and the World Health Organization Index Medicus), Google Scholar and stakeholder-identified manuscripts, ultimately including English evidence published from sub-Saharan Africa from 2014 to 2021. Measures were extracted, organized, then reviewed with key stakeholders. RESULTS AND DISCUSSION We screened 14,885 titles/abstracts, included 118 full-texts and identified 110 measures of engagement, categorized into three engagement dimensions ("retention," "adherence" and "active self-management"), a combination category ("multi-dimensional engagement") and "treatment outcomes" category (e.g. viral load as an end-result reflecting that engagement occurred). Retention reflected status in care, continuity of attendance and visit timing. Adherence was assessed by a variety of measures categorized into primary (prescription not filled) and secondary measures (medication not taken as directed). Active self-management reflected involvement in care and self-management. Three overarching use cases were identified: research to make recommendations, routine monitoring for quality improvement and strategic decision-making and assessment of individual patients. CONCLUSIONS Heterogeneity in conceptualizing engagement with HIV care is reflected by the broad range of measures identified and the lack of consensus on "gold-standard" indicators. This review organized metrics into five categories based on the dimensions of engagement; further work could identify a standardized, minimum set of measures useful for comprehensive evaluation of engagement for different use cases. In the interim, measurement of engagement could be advanced through the assessment of multiple categories for a more thorough evaluation, conducting sensitivity analyses with commonly used measures for more comparable outputs and using longitudinal measures to evaluate engagement patterns. This could improve research, programme evaluation and nuanced assessment of individual patient engagement in HIV care.
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Affiliation(s)
- Claire M. Keene
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Ayesha Ragunathan
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Jonathan Euvrard
- Centre for Infectious Disease Epidemiology and ResearchSchool of Public Health and Family MedicineFaculty of Health SciencesUniversity of Cape TownCape TownSouth Africa
| | - Mike English
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Jacob McKnight
- Health Systems CollaborativeOxford Centre for Global Health ResearchNuffield Department of MedicineUniversity of OxfordOxfordUnited Kingdom
| | - Catherine Orrell
- Department of MedicineFaculty of Health SciencesUniversity of Cape TownCape TownSouth Africa
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Nardell MF, Adeoti O, Peters C, Kakuhikire B, Govathson-Mandimika C, Long L, Pascoe S, Tsai AC, Katz IT. Men missing from the HIV care continuum in sub-Saharan Africa: a meta-analysis and meta-synthesis. J Int AIDS Soc 2022; 25:e25889. [PMID: 35324089 PMCID: PMC8944222 DOI: 10.1002/jia2.25889] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 02/01/2022] [Indexed: 02/03/2023] Open
Abstract
Introduction Men are missing along the HIV care continuum. However, the estimated proportions of men in sub‐Saharan Africa meeting the UNAIDS 95‐95‐95 goals vary substantially between studies. We sought to estimate proportions of men meeting each of the 95‐95‐95 goals across studies in sub‐Saharan Africa, describe heterogeneity, and summarize qualitative evidence on factors influencing care engagement. Methods We systematically searched PubMed and Embase for peer‐reviewed articles published between 1 January 2014 and 16 October 2020. We included studies involving men ≥15 years old, with data from 2009 onward, reporting on at least one 95‐95‐95 goal in sub‐Saharan Africa. We estimated pooled proportions of men meeting these goals using DerSimonion‐Laird random effects models, stratifying by study population (e.g. studies focusing exclusively on men who have sex with men vs. studies that did not), facility setting (healthcare vs. community site), region (eastern/southern Africa vs. western/central Africa), outcome measurement (e.g. threshold for viral load suppression), median year of data collection (before vs. during or after 2017) and quality criteria. Data from qualitative studies exploring barriers to men's HIV care engagement were summarized using meta‐synthesis. Results and discussion We screened 14,896 studies and included 129 studies in the meta‐analysis, compiling data over the data collection period. Forty‐seven studies reported data on knowledge of serostatus, 43 studies reported on antiretroviral therapy use and 74 studies reported on viral suppression. Approximately half of men with HIV reported not knowing their status (0.49 [95% CI, 0.41–0.58; range, 0.09–0.97]) or not being on treatment (0.58 [95% CI, 0.51–0.65; range, 0.07–0.97]), while over three‐quarters of men achieved viral suppression on treatment (0.79 [95% CI, 0.77–0.81; range, 0.39–0.97]. Heterogeneity was high, with variation in estimates across study populations, settings and outcomes. The meta‐synthesis of 40 studies identified three primary domains in which men described risks associated with engagement in HIV care: perceived social norms, health system challenges and poverty. Conclusions Psychosocial and systems‐level interventions that change men's perceptions of social norms, improve trust in and accessibility of the health system, and address costs of accessing care are needed to better engage men, especially in HIV testing and treatment.
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Affiliation(s)
- Maria F Nardell
- Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.,Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.,Harvard Medical School, Boston, Massachusetts, USA
| | - Oluwatomi Adeoti
- Department of Medicine, Boston Medical Center, Boston, Massachusetts, USA
| | - Carson Peters
- Department of Epidemiology, University of Iowa College of Public Health, Iowa City, Iowa, USA
| | - Bernard Kakuhikire
- Faculty of Business and Management Sciences, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Caroline Govathson-Mandimika
- Health Economics and Epidemiology Research Office, University of the Witwatersrand, Johannesburg, South Africa.,Department of Internal Medicine, School of Clinical Medicine, University of the Witwatersrand, Johannesburg, South Africa
| | - Lawrence Long
- Health Economics and Epidemiology Research Office, University of the Witwatersrand, Johannesburg, South Africa.,Department of Internal Medicine, School of Clinical Medicine, University of the Witwatersrand, Johannesburg, South Africa.,Department of Global Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Sophie Pascoe
- Health Economics and Epidemiology Research Office, University of the Witwatersrand, Johannesburg, South Africa.,Department of Internal Medicine, School of Clinical Medicine, University of the Witwatersrand, Johannesburg, South Africa
| | - Alexander C Tsai
- Harvard Medical School, Boston, Massachusetts, USA.,Mongan Institute, Massachusetts General Hospital, Boston, Massachusetts, USA.,Center for Global Health, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Ingrid T Katz
- Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.,Harvard Medical School, Boston, Massachusetts, USA.,Center for Global Health, Massachusetts General Hospital, Boston, Massachusetts, USA.,Harvard Global Health Institute, Cambridge, Massachusetts, USA
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Gumede SB, de Wit JBF, Venter WDF, Lalla-Edward ST. Study protocol: Strengthening understanding of effective adherence strategies for first-line and second-line antiretroviral therapy (ART) in selected rural and urban communities in South Africa. PLoS One 2021; 16:e0261107. [PMID: 34932588 PMCID: PMC8691643 DOI: 10.1371/journal.pone.0261107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 11/24/2021] [Indexed: 11/19/2022] Open
Abstract
Multiple factors make adherence to antiretroviral therapy (ART) a complex process. This study aims to describe the barriers and facilitators to adherence for patients receiving first-line and second-line ART, identify different adherence strategies utilized and make recommendations for an improved adherence strategy. This mixed method parallel convergent study will be conducted in seven high volume public health facilities in Gauteng and one in Limpopo province in South Africa. The study consists of four phases; a retrospective secondary data analysis of a large cohort of patients on ART (using TIER.Net, an ART patient and data management system for recording and monitoring patients on ART and tuberculosis (TB)) from seven Johannesburg inner-city public health facilities (Gauteng province); a secondary data analysis of the Intensified Treatment Monitoring Accumulation (ITREMA) trial (a randomized control trial which ran from June 2015 to January 2019) conducted at the Ndlovu Medical Center (Limpopo province); in-depth interviews with people living with Human Immunodeficiency Virus (PLHIV) who are taking ART (in both urban and rural settings); and a systematic review of the impact of treatment adherence interventions for chronic conditions in sub-Saharan Africa. Data will be collected on demographics, socio-economic status, treatment support, retention in care status, disclosure, stigma, clinical markers (CD4 count and viral load (VL)), self-reported adherence information, intrapersonal, and interpersonal factors, community networks, and policy level factors. The systematic review will follow the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) reporting and Population, Interventions, Comparisons and Outcomes (PICO) criteria. Analyses will involve tests of association (Chi-square and t-test), thematic analysis (deductive and inductive approaches) and network meta-analysis. Using an integrated multilevel socio-ecological framework this study will describe the factors associated with adherence for PLHIV who are taking first-line or second-line ART. Implementing evidence-based adherence approaches, when taken up, will improve patient's overall health outcomes. Our study results will provide guidance regarding context-specific intervention strategies to improve ART adherence.
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Affiliation(s)
- Siphamandla Bonga Gumede
- Ezintsha, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
- Faculty of Social and Behavioural Sciences, Department of Interdisciplinary Social Science, Utrecht University, The Netherlands
| | - John Benjamin Frank de Wit
- Faculty of Social and Behavioural Sciences, Department of Interdisciplinary Social Science, Utrecht University, The Netherlands
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Gumede SB, Venter WDF, Lalla-Edward ST. Understanding adherence in virally suppressed and unsuppressed human immunodeficiency virus-positive urban patients on second-line antiretroviral treatment. South Afr J HIV Med 2020; 21:1107. [PMID: 32934834 PMCID: PMC7479367 DOI: 10.4102/sajhivmed.v21i1.1107] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 06/13/2020] [Indexed: 12/25/2022] Open
Abstract
Background Understanding antiretroviral therapy (ART) adherence may assist in designing effective support interventions. Objectives This study elicited perspectives on how to promote treatment adherence from virologically suppressed and unsuppressed patients receiving second-line ART. Methods This was a cross-sectional study conducted with randomly selected patients active on second-line ART, from five public health facilities in the Johannesburg inner city. Data were collected on demographics, clinical information, participant’s experiences and ART knowledge. Virological failure was defined as exceeding 1000 copies/mL. Results The study sample comprised 149 participants; of which 47.7% (n = 71) were virally unsuppressed and 69.1% (n = 103) were women; the median age of the participants was 42 years (interquartile range [IQR] 36–47 years). Experiencing medication-related difficulties in taking second-line ART (p = 0.003), finding second-line regimen more difficult to take than a first-line regimen (p = 0.001) and experiencing side effects (p < 0.001) were all subjective predictors of virological failure. Participants’ recommendations for improving adherence included the introduction of a single tablet regimen (31.6%, n = 55), reducing the dosage to once daily (26.4%, n = 46) and reducing the pill size for second-line regimen (4.0%, n = 7). Conclusion The results of this study highlight the importance of improving patients’ knowledge about adherence and motivation to continue ART use despite the persistence of side effects and difficulties with taking medication.
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Affiliation(s)
- Siphamandla B Gumede
- Ezintsha, a sub-division of Wits Reproductive Health and HIV Institute, University of the Witwatersrand, Johannesburg, South Africa.,Department of Interdisciplinary Social Science, Public Health, Utrecht University, Utrecht, The Netherlands
| | - Willem D F Venter
- Ezintsha, a sub-division of Wits Reproductive Health and HIV Institute, University of the Witwatersrand, Johannesburg, South Africa
| | - Samanta T Lalla-Edward
- Ezintsha, a sub-division of Wits Reproductive Health and HIV Institute, University of the Witwatersrand, Johannesburg, South Africa
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Mbengue MAS, Chasela C, Onoya D, Mboup S, Fox MP, Evans D. Clinical predictor score to identify patients at risk of poor viral load suppression at six months on antiretroviral therapy: results from a prospective cohort study in Johannesburg, South Africa. Clin Epidemiol 2019; 11:359-373. [PMID: 31191029 PMCID: PMC6511618 DOI: 10.2147/clep.s197741] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 02/27/2019] [Indexed: 02/05/2023] Open
Abstract
Purpose: As countries work toward 90:90:90 targets, early identification of patients with inadequate response to antiretroviral therapy (ART) is critical for achieving optimal HIV treatment outcomes. We developed and evaluated a clinical prediction score (CPS) to identify HIV-positive patients at risk of poor viral load suppression at 6 months on ART. Patients and methods: We conducted a prospective cohort study of HIV-positive ART naïve adults (≥18 years) initiating standard first-line ART between February 2012 and April 2014 at Themba Lethu Clinic in Johannesburg, South Africa. We used Modified Poisson regression to estimate the association between patient characteristics and poor viral load suppression, defined as a viral load ≥400 copies/mL at 6 months on ART. We developed a CPS following the Spiegel Halter and Knill-Jones approach and determined the diagnostic accuracy compared to viral load as the "gold standard". We identified the optimal cutoff at which the CPS would identify those at risk of poor viral load suppression. Results: Among 353 patients, 67.7% had a viral load measurement at 6 months on ART and 30.1% of these were viremic (≥400 copies/mL). Male gender, platelet count <150 cells/mm3, ≥7 days late for ≥2 ARV visits, visual analog scale (VAS) <90% and <14.5 fL increase in mean cell volume from baseline to 6 months were included in the CPS. The optimal cutoff was 5 (≥5 vs <5; sensitivity [Se] 65.3%, specificity [Sp] 46.7%) and the CPS performed better than standard measures of adherence (eg, VAS Se 24.5%; Simplified Medication Adherence Questionnaire Se 26.5%). Conclusion: Our findings suggest a 6-month CPS may have the potential to identify patients at risk of poor viral load suppression. The CPS may be used to target patients who need intensive adherence support, with the caveat that there may be a three- to four-fold increase in the pool of patients identified for adherence counseling.
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Affiliation(s)
- Mouhamed Abdou Salam Mbengue
- Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
- Department of Biostatistics and Health Economics, IRESSEF: Institute of Health Research, Epidemiologic Surveillance and Training, Dakar, Senegal
| | - Charles Chasela
- Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
- Epidemiology and Strategic Information, HIV/AIDS, STIs & TB, Human Sciences Research Council, Pretoria, South Africa
| | - Dorina Onoya
- Health Economics and Epidemiology Research Office, Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Souleymane Mboup
- Department of Biostatistics and Health Economics, IRESSEF: Institute of Health Research, Epidemiologic Surveillance and Training, Dakar, Senegal
| | - Matthew P Fox
- Department of Global Health, Boston University School of Public Health, Boston, MA, USA
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Denise Evans
- Health Economics and Epidemiology Research Office, Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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