Table I.

Self-Report, Pill Count, and Serum Blood Level Measures of Medication Adherence

	Adherence rates (percentages, standard deviation) by measure
Time point	Self-report	Pill count	Nonzero blood levels
Trial average	94.76%, SD = 8.60	91.93 %, SD = 10.05	—
Trial month 1	94.50%, SD = 10.29	91.23 %, SD = 13.32	—
Trial month 2	95.98%, SD = 8.39	91.78 %, SD = 11.23	—
Trial month 3	95.82%, SD = 9.99	92.30 %, SD = 11.47	84.04 %, SD = 36.71
Trial month 4	95.73%, SD = 9.85	93.79 %, SD = 9.98	—
Trial month 5	95.28%, SD = 11.96	93.38 %, SD = 10.42	—
Trial month 6	94.58%, SD = 13.13	93.98 %, SD = 9.13	76.10 %, SD = 42.75