Table 1.

Summary of covariate values.

Covariate	Mean	SD
Age in years	44.80	11.06
Annual household income in $1,000s	47.47	24.81
Years of education	13.71	1.77
Fagerström Test of Cigarette Dependence (FTCD)	5.39	2.13
Nicotine Dependence Syndrome Scale	−0.23	0.91
Wisconsin Inventory of Smoking Dependence Motives-68: Primary scales	4.92	1.18
Wisconsin Inventory of Smoking Dependence Motives-68: Secondary scales	3.79	1.08
Cigarettes per day	21.41	8.95
Years Smoked	26.41	11.24
Number of past quit attempts	4.92	4.41
Longest period abstinent in days	80.84	99.36
Past mood disorder (1=yes, 0=no lifetime mood disorder)	0.18	0.38
Baseline self-efficacy	5.60	1.38
Baseline Wisconsin Smoking Withdrawal Scale: Craving subscale	2.45	0.81
Baseline Wisconsin Smoking Withdrawal Scale: Sleep subscale	1.87	1.00