Table 4.

Independent variables related to smoking cessation yielded by logistic regression analysis.

Variable	OR (95% CI)	P-value
Cig/d smoked before pregnancy (continuous)	0.85 (0.82–0.87)	< 0.001
Kessner index (ref. inadequate):
intermediate	1.14 (0.55–2.36)	0.718
adequate	2.72 (1.30–5.68)	0.008
Partner's smoking (ref. no)	0.57 (0.38–0.87)	0.010
No. of previous pregnancies (continuous)	0.75 (0.60–0.94)	0.014
Year of the study period (continuous)	0.77 (0.68–0.89)	< 0.001