Table 1

The prevalence of smoking and use of snus at age 14–15 years and 19 years, and e-cigarette use at age 19 years*

	Girls		Boys		Difference by sex, p value	All
	n	%	n	%	Difference by sex, p value	n	%
Parental smoking at age 14–15 years
Father smoker	129/1034	12.5	127/1093	11.6	0.544	256/2127	12.0
Mother smoker	115/1036	11.1	146/1092	13.4	0.111	261/2128	12.3
Tobacco use at age 14–15 years
Never smoker	932/1053	88.5	1012/1108	91.3		1944/2161	90.0
Occasional smoker	81/1053	7.7	67/1108	6.0		148/2161	6.8
Daily smoker	40/1053	3.8	29/1108	2.6	0.083	69/2161	3.2
Never snus user	1036/1055	98.2	1034/1109	93.2		2070/2164	95.7
Occasional snus user	11/1055	1.0	19/1109	1.7		30/2164	1.4
Daily snus user	8/1055	0.8	56/1109	5.0	<0.001	64/2164	3.0
Tobacco use at age 19 years
Never smoker	666/1044	63.8	662/1105	59.9		1328/2149	61.8
Former smoker	14/1044	1.3	15/1105	1.4		29/2149	1.3
Occasional smoker	267/1044	25.6	346/1105	31.3		613/2149	28.5
Daily smoker	97/1044	9.3	82/1105	7.4	0.021	179/2149	8.3
Daily snus user	65/1052	6.2	247/1111	22.2	<0.001	312/2163	14.4
E-cigarette use at age 19 years
Ever tried/used e-cigarettes	158/1049	15.1	302/1096	27.6	<0.001	460/2145	21.4
Current e-cigarette user	36/1049	3.4	54/1096	4.9	0.084	90/2145	4.2

*Individuals with missing answers in the individual questions about tobacco use and e-cigarette use were excluded from the analysis.
e-cigarette, electronic cigarette.