Table 3.

Correlations between self-reported varenicline pill count and varenicline plasma levels.

Measures of adherence	Plasma varenicline (ng/ml)	3-Day pill count	7-Day pill count	14-Day pill count	12-Week pill count
Plasma varenicline (ng/ml)	1	–	–	–	–
3-Day Pill Count	0.23 (0.05)	1	–	–	–
7-Day Pill Count	0.21 (0.07)	0.83 (<0.001)	1	–	–
4-Week Pill Count	0.24 (0.04)	0.58 (<0.001)	0.68 (<0.001)	1	–
Total Pill Count	−0.02 (0.90)	0.45 (<0.001)	0.48 (<0.001)	0.75 (<0.001)	1

Note. Spearman correlation coefficients are displayed. p-Values (2-tailed) are indicated in brackets. Higher values reflect greater adherence.

Bold numbers indicate significant correlations between plasma varenicline and self-report measure.