Determinants of adherence to highly active antiretroviral therapy among HIV-1-infected patients in Côte d'Ivoire

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Abstract
To assess adherence to HAART and to determine factors associated with poor adherence among HIV-1-infected patients in Abidjan, Côte d'Ivoire. A prospective observational study of 614 consecutive patients attending an HIV/AIDS outpatient clinic. Adherence was measured twice at 3-month intervals by self-report of missing doses over 4 days. An adherence level of less than 95% was defined as poor adherence. We used generalized estimating equation models for binomial distribution with repeated measures for data analysis. Of the 591 subjects who completed the study, 74.3% reported adherence levels of 95% or greater. Six factors were independently related to poor adherence: age less than 35 years [relative risk (RR) 1.45; 95% confidence interval (CI) 1.17-1.79], absence of social support (RR 1.66; 95% CI 1.24-2.24), number of daily pills 10 or more (RR 1.47; 95% CI 1.14-1.91), time of adherence assessment (first versus second time assessment RR 1.36; 95% CI 1.12-1.66), CD4 cell count of 250 cells/mul or greater (RR 1.43; 95% CI 1.10-1.88), and not being less worried about HIV infection now that treatments have improved (RR 1.26; 95% CI 1.01-1.58). Drug supply interruptions in the pharmacies were reported by 10.0% of the non-adherent patients as the reason for missing pills. Psychosocial factors were found to impact adherence and should be analysed in more detail by further studies. Scaling up antiretroviral therapy in sub-Saharan Africa should be preceded by reliable drug supply and distribution systems.