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Table 3 Age at first consumption of alcohol, tobacco, and cannabis—differentiated by immigration background
| Substance | Total sample Mean (SD) | Total sample Median | Adolescents with immigration background Mean (SD) | Adolescents without immigration background Mean (SD) | t value | p-value | 95 % confidence interval for the difference | |
|---|---|---|---|---|---|---|---|---|
| Alcohol | (N = 7810) | 12.87 (1.95) | 13.00 | 12.75 (2.33) | 12.90 (1.83) | 2393 | .017 | .027–.271 |
| Tobacco | (N = 3153) | 13.28 (1.86) | 14.00 | 13.13 (2.11) | 13.33 (1.76) | 2457 | .014 | .040–.357 |
| Cannabis | (N = 1156) | 14.33 (1.07) | 14.00 | 13.13 (2.11) | 14.33 (1.04) | −.493 | .622 | −.177–.108 |
