SR:3-day Self-Reported adherence; FTC-TP: emtricitabine triphosphate; Quant: Quantifiable; BLQ: Below the Limit of Quantification. *p-values adjusted for multiple comparisons using the Tukey-Kramer adjustment.
**Adjusted for age, age, gender, race, body mass index (BMI), estimated glomerular filtration rate (eGFR, estimated using MDRD equation), CD4+ T-cell count, hematocrit, and ART class. FTC-TP in DBS was considered BLQ if it was <0.1 pmol/sample.