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. Author manuscript; available in PMC: 2013 Nov 4.
Published in final edited form as: J Natl Med Assoc. 2008 Dec;100(12):1417–1424. doi: 10.1016/s0027-9684(15)31541-8

Figure 1. Schematic representation of study definitions for qualifying drug initiation and discontinuation using the TennCare pharmacy data file.

Figure 1

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