Table 1.

Participant Characteristics

Population characteristics	n = 115
Caucasian, %	94
Married, %	16
Weeks pregnant at intake	10.0 (0.4)
Living with other smoker(s), %	82
With private insurance, %	23
Age started smoking, years	15.5 (0.3)
Intake CO, ppm	9.4 (0.6)
Intake urinary cotinine, ng/ml	867.6 (54.9)
First pregnancy, %	65
Group characteristics	Drug negative (n = 75)	Drug positive (n = 40)	p Values
Demographics
Age, years	25.2 (0.6)	23.6 (0.7)	0.07
Education, years	12.2 (0.2)	12.1 (0.1)	0.78
BDI score	10.3 (0.9)	10.8 (0.9)	0.71
Smoking characteristics
Cigarettes/day prepregnancy	17.5 (0.9)	19.8 (1.4)	0.16
Cigarettes/day in past 7 days	8.9 (0.8)	7.9 (0.8)	0.39

Note. Values shown as mean (standard error) unless indicated otherwise. BDI = Beck Depression Inventory.