Table 6.

Stratified analysis of the interaction between variables "Passive smoking" and "Fagerström test" in the relapse of smoking.

360 days		Fagerström test
		Very low to medium	High to very high	OR	95% CI	P
Passive smoking	no	66/174 (37.9%)	44/53 (83%)	8.00	3.67-17.45	<0.001
	yes	19/24 (79.2%)	13/16 (81.3%)	1.14	0.23-5.62	0.872
	OR	6.2	0.89
	95% CI	2.22-17.45	0.21-3.76
	P	0.001	0.870

CI=confidence interval; OR=odds ratio