Table 2.

Agreement between nevirapine concentration and maternal verbal reports (MVR) and unused returned nevirapine (NVP) in identifying missed doses at the 5 week visit

Adherence measure	Sensitivity	Specificity	PPV	NPV	P-value *
MVR n (%) 95% CI	6/8 (75%) (35; 97)	32/41 (78%) (62; 89)	6/15 (40%) (16; 68)	32/34 (94%) (80; 99)	0,03
unused returned NVP n (%) 95% CI	6/8 (75%) (35; 97)	17/41 (42%) (26; 58)	6/30 (20%) (8; 39)	17/19 (89%) (67; 99)	<0.001

*P-value represents the comparison between maternal verbal reports/unused returned nevirapine and NVP concentration.