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

From: 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

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%
  1. Significant values are shown in italics
  2. χ2—Chi square test value. p—p-value