Table 3.
Trends in proportions of past year cannabis use (n = 566,912).
| T1 2010–2013 | T2 2014–2016 | T3 2017–2019 | |
|---|---|---|---|
| % (95% CI) | % (95% CI) | % (95% CI) | |
| Boys | |||
| None | 93.1 (92.8, 93.3) | 93.0 (92.8, 93.2) | 90.5 (90.3, 90.6) |
| - Once | 2.5 (2.4, 2.7) | 2.4 (2.3, 2.5) | 3.0 (2.9, 3.1) |
| −2–5 times | 2.1 (1.9, 2.2) | 2.0 (1.9, 2.1) | 2.8 (2.7, 2.9) |
| −6–10 times | 0.7 (0.6, 0.7) | 0.7 (0.6, 0.7) | 0.9 (0.9, 1.0) |
| −11 times or more | 1.7 (1.6, 1.8) | 1.9 (1.8, 2.0) | 2.8 (2.7, 2.9) |
| Changec | n/a | – a | >T1, T2b |
| Girls | |||
| None | 95.8 (95.6, 96.0) | 95.6 (95.5, 95.7) | 94.5 (94.4, 94.7) |
| - Once | 1.8 (1.7, 1.9) | 1.9 (1.8, 2.0) | 2.3 (2.2, 2.3) |
| −2–5 times | 1.4 (1.3, 1.6) | 1.4 (1.3, 1.5) | 1.8 (1.8, 1.9) |
| −6–10 times | 0.4 (0.3, 0.4) | 0.4 (0.4, 0.5) | 0.5 (0.5, 0.5) |
| −11 times or more | 0.6 (0.5, 0.7) | 0.7 (0.6, 0.7) | 0.9 (0.8, 0.9) |
| Changec | n/a | –a | >T1, T2b |
| Gender ratio (boys:girls) | |||
| Any use | 1.6:1 | 1.6:1 | 1.7:1 |
| Frequent use | 2.7:1 | 2.8:1 | 3.2:1 |
The estimates are adjusted for age, geographical location, and municipality population.
Individuals with missing data on municipality population (n = 1,604) are excluded from the analysis.
a
Compared with proportions in T1.
b
Compared with proportions in T1 and T2.
c
Changes at p value < 0.001 are specified in the table: “>” implies significant increase; “ < ” implies significant decrease; and “–” implies no change compared with previous time period(s).