Gender-specific substance use patterns and associations with individual, family, peer, and school factors in 15-year-old Portuguese adolescents: a latent class regression analysis

Table 2 Descriptive statistics for substance use indicators, stratified by gender

Substance use indicator	Boys	Girls	χ²	p
Alcohol age of initiation			16.865	< 0.001
Never	18%	20.8%
≥ 13 years old	29.9%	20.8%
< 13 years old	52.1%	58.5%
Drunkenness age of initiation			6.934	0.031
Never	62.4%	68%
≥ 13 years old	34%	30%
< 13 years old	3.4%	2%
Smoking age of initiation			1.915	0.384
Never	62.4%	58.4%
≥ 13 years old	34%	33.1%
< 13 years old	3.4%	7.6%
Cannabis lifetime			23.04	0.002
Never	84.4%	90.8%
Once or twice	6.3%	4.6%
3–5 times	2.5%	0.8%
6–9 times	0.9%	0.8%
10–19 times	1.6%	0.9%
20–39 times	0.4%	0.6%
40 times or more	2.9%	0.8%
Alcohol past 30-day use			47.962	< 0.001
Never	46.5%	49.9%
Once or twice	26.9%	35.1%
3–5 times	12.4%	9.7%
6–9 times	5.75	2.3%
10–19 times	4.3%	1.6%
20–39 times	0.9%	–
40 times or more	1.5%	0.5%
Drunkenness past 30-day			11.130	0.133
Never	85%	88.9%
Once or twice	9.1%	7.9%
3–5 times	1.9%	0.95
6–9 times	0.4%	0.5%
10–19 times	0.6%	0.2%
20–39 times	0.3%	0.2%
40 times or more	0.9%	0.1%
Smoking past 30-day			9.112	0.245
Never	79.4%	80.6%
Once or twice	6.8%	7.2%
3–5 times	1.6%	1.8%
6–9 times	2.8%	1.3%
10–19 times	2.1%	2.7%
20–39 times	2.25	2.5%
40 times or more	4.1%	3.4%

ISSN: 1753-2000