Table 2.

Descriptive Statistics of Outcome Variables and GEE Results by Group over Time

	MI + Education	Education Alone	Parameter Estimate	95% Confidence Interval
Air nicotine, median (IQR)
Baseline	1.15 (0.24 to 2.92)	0.58 (0.08 to 2.01)	0.63	0.20 to 1.06
3 mo	0.71 (022 to 1.88)	0.51 (0.06 to 1.72)	−0.16	−0.5 to 0.17
6 mo	0.75 (0.22 to 2.08)	0.52 (0.05 to 1.61)	−0.07	−0.41 to 0.26
12 mo	0.55 (0.07 to 1.37)	0.32 (0.04 to 1.50)	−0.33	−0.67 to −0.01
Salivary cotinine, median (IQR)
Baseline	4.14 (1.18 to 7.51)	3.00 (1.34 to 6.26)	0.27	0.03 to 0.51
3 mo	4.14 (1.63 to 6.97)	3.25 (1.24 to 6.42)	−0.02	−0.21 to 0.17
6 mo	3.61 (1.55 to 7.41)	3.05 (1.32 to 5.92)	−0.11	−0.33 to 0.11
12 mo	4.04 (2.14 to 7.17)	2.84 (1.38 to 6.07)	−0.02	−0.26 to 0.22
Complete home smoking ban, n (%)
Baseline	34 (20.6)	47 (28.5)	0.65	0.39 to 1.08
3 mo	46 (36.5)	49 (35.5)	1.72	1.05 to 2.80
6 mo	43 (35.6)	57 (40.7)	1.38	0.81 to 2.37
12 mo	44 (39.3)	57 (40.7)	1.48	0.85 to 2.60
Caregiver smoker status, n (%)
Baseline	122 (73.9)	110 (66.7)	1.42	0.88 to 2.28
3 mo	83 (65.9)	85 (61.6)	0.51	0.27 to 0.94
6 mo	76 (62.8)	88 (62.9)	0.71	0.36 to 1.40
12 mo	68 (60.7)	84 (60.0)	0.42	0.51 to 0.83

Definition of abbreviations: GEE = generalized estimating equation; IQR = interquartile range; MI = motivational interviewing.