Table 1.

Distribution of sociodemographic characteristics of the study population in all survey years, year before the partial ban (2013), years between the partial and comprehensive bans (2014–2015), and years after the comprehensive ban (2016–2017)

	All survey years	2013	2014–2015	2016–2017
N observations	6202	1357	2443	2402
Gender
Male	51.1	51.7	51.4	50.4
Female	48.9	48.3	48.6	49.6
Age (mean, SD), years	14.5 (1.12)	14.6 (1.12)	14.5 (1.12)	14.5 (1.12)
12	<0.1	0	0	0.1
13	20.9	20.5	21.1	20.8
14	31.8	30.2	31.4	33.1
15	18.7	19.0	19.0	18.2
16	28.2	30.0	28.0	27.3
17	0.4	0.3	0.5	0.5
Ethnicity
White	94.6	94.5	94.8	94.3
Non-white	5.4	5.5	5.2	5.7
School year
Second year	53.0	51.1	52.8	54.2
Fourth year	47.0	48.9	47.2	45.8
Family Affluence Scale (FAS)
Low	32.7	33.1	33.0	32.3
Intermediate	32.7	32.6	32.4	33.0
High	34.6	34.3	34.6	34.8
Smoking status
Non-(current) smoker	95.4	94.7	96.0	95.3
Current smoker	4.6	5.3	4.0	4.7
E-cigarette use
Never used	59.9	–	84.6	68.5
Used once or twice	12.5	–	12.1	20.0
Current/past occasional or regular use	5.8	–	3.3	11.5
2013 (missing)	21.9	100	–	–
Family smoking
Non-smoking family members	61.2	56.0	60.1	65.3
One smoking family member	22.5	24.7	23.0	20.6
At least two smoking family members	16.3	19.3	16.8	14.1
Friend smoking
None of them	54.1	55.1	60.3	47.3
At least some of them	34.2	34.3	28.0	40.5
Don’t know	11.6	10.5	11.7	12.2
Visits to supermarkets
Rarely	21.4	20.0	21.4	22.3
Sometimes	57.0	56.4	56.2	58.1
Often	21.6	23.6	22.5	19.6
Visits to small shops
Rarely	12.7	9.0	12.1	15.5
Sometimes	44.1	41.8	45.1	44.4
Often	43.2	49.2	42.8	40.1

Numbers represent percentages unless indicated otherwise.