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Although adherence to HAART at a level above 95% has been associated with optimal viral suppression, the impact of different levels of adherence on long-term clinical outcomes has not been determined. We used an objective pharmacy-based measure to examine the association between three levels of adherence to HAART and disease progression among a population-based cohort of HIV-infected patients attending an urban HIV specialty clinic. Higher levels of adherence to HAART were significantly associated with longer time to virologic failure (P 0.2). Patients who progressed to AIDS or death had significantly higher viral loads (P = 0.01) and lower CD4 cell counts (P = 0.03) than patients who experienced virologic failure, but did not progress.
Kitahata et al. (Mon,) studied this question.