Table 2.

Correlation of methods for adherence measurement

	Self-report (n = 186)		Physician rating (n=211)		Prescription refill (n=121)		Plasma concentration (n=223)
	r	p	r	p	r	p	r	p
Self-report	1	-	0.369	<0.001*	0.189	0.050*	0.223	0.002*
Physician rating			1	-	0.243	0.006*	0.265	<0.001*
Prescription refill					1	-	0.251	0.005*
Plasma concentration							1	-

*indicates significant correlation (p<0.05).