Table 1.

Prevalence (%) of tobacco use in relation to demographic factors, at the age of 14–15 years

	Smoking				Snus use
	Bivariate analysis		Multivariate analysis		Bivariate analysis		Multivariate analysis
	Daily smoking (%)	Difference p value	OR	95% CI	Daily use of snus (%)	Difference p value	OR	95% CI
Sex
Boys	2.7		1.00		5.5		5.72	2.76 to 11.85
Girls	4.4	0.021	1.95	1.11 to 3.41	1.0	<0.001	1.00
Tobacco intervention
Control	3.5		1.00		3.1		1.00
Participant	0.9		0.20	0.03 to 1.48	0.9		0.53	0.12 to 2.27
Non-participant	4.9	0.073	1.26	0.51 to 3.16	7.7	0.023	2.14	1.05 to 4.37
Mother smoking
No	2.5				2.5
Yes	10.1	<0.001	2.46	1.29 to 4.68	8.4	<0.001	3.38	1.76 to 6.50
Father smoking
No	2.6				3.0
Yes	10.2	<0.001	1.79	0.93 to 3.45	5.6	0.023	0.76	0.34 to 1.66
Mother using snus
No	3.1				2.7
Yes	6.7	0.005	1.19	0.54 to 2.64	8.0	<0.001	1.72	0.85 to 3.48
Father using snus
No	2.5				1.8
Yes	5.8	<0.001	1.65	0.94 to 2.90	6.6	<0.001	3.20	1.81 to 5.64
Living conditions
House	3.1		1.00		2.7		1.00
Apartment	5.9		0.79	0.38 to 1.63	6.1		1.78	0.91 to 3.47
Both	2.6	0.026	0.75	0.21 to 2.71	1.7	0.002	0.32	0.04 to 2.49
Single parent household	7.4		1.34	0.64 to 2.81	6.4		1.07	0.49 to 2.34
Two parent household	3.0	<0.001	1.00		2.8	0.001	1.00
Participation in sports
No	7.8		1.00		4.9		1.00
Yes	1.8	<0.001	0.30	0.17 to 0.52	2.7	0.006	0.67	0.39 to 1.18
Parental socioeconomic status
Professionals	0.8		1.00		2.1		1.00
Self-employed	7.2		6.07	1.70 to 21.72	3.2		0.90	0.23 to 3.50
Intermediate non-manual	1.9		2.22	0.68 to 7.25	2.8		1.25	0.53 to 2.94
Assistant non-manual	3.7		3.65	1.09 to 12.21	2.6		0.75	0.24 to 2.37
Manual workers industry	5.6		4.57	1.44 to 14.47	4.9		1.58	0.64 to 3.93
Manual workers service	4.4		3.06	0.89 to 10.50	5.6		1.63	0.63 to 4.22
Unemployed	20.0	<0.001	14.21	3.49 to 57.84	5.0	0.005	0.80	0.14 to 4.60

Significant factors in the bivariate analyses were included in a multiple logistic regression analysis and expressed as ORs with 95% CI.