Baseline characteristics of the study population.*

*Baseline is the beginning of the poor adherence period which was defined as 2 consecutive self-reports of missed doses at least 1 per week over at least a 12 week period.√See Methods section for definition.¶Patients suppressed on the current regimen at baseline and throughout the study period.IQR = interquartile range, SD = standard deviation, BMI = body max index, IDU = injecting drug use.3TC = lamivudine, ABC = abacavir, AZT = zidovudine, d4T = stavudine, DDI = didanosine, FTC = emtricitabine, TDF = tenofovir.