Table 2. Summary of logistic regression analysis (major effects) for prediction of smoking abstinency by nonsmokers (n=380).

Variable		OR	SE	95 % CI	Nagelkerke’s R2
First step of regression					0.15
Study group (ref.: control group)		4.03	0.48	1.58–10.24
Age		1.18	0.12	0.92–1.50
Sex (ref.: male)		2.25	0.42	0.99–5.10
Type of school (ref.: part-/full-time vocational school)
	Secondary general and intermediate school	4.08	0.81	0.83–20.05
	Grammar school	1.80	1.00	0.26–12.69
	Comprehensive school	1.24	1.29	0.10–15.50
Last step of regression					0.10
Study group (ref.: control group)		4.14	0.47	1.66–10.36
Sex (ref.: male)		2.26	0.39	1.05–4.88

OR=odds ratio; SE=standard error; CI=confidence interval; ref.=reference group