To qualify for the overall study cohort, an individual was required to have been non-Hispanic white or black and have ≥1 additional prescription medication refill (of any type) and/or 1 HIV-related medical encounter during the first 90 days after entry. Entry date could have been from January 1, 1996 to June 30, 2003. Schema A represents a nondiscontinuer; Schema B represents an individual defined as an early discontinuer, including the subgroup included in the validation analysis.
ART: Antiretroviral therapy; PI: Protease inhibitor; NNRTI: Non-nucleoside reverse transcriptase inhibitor