Table 1.
Characteristic | Cannabis use (n = 22) |
|
n | % | |
Design | ||
Repeated cross-sectional | 15 | 68.2 |
Single cross-sectional | 7 | 31.8 |
World regiona | ||
North America | 7 | 31.8 |
Europe | 8 | 36.4 |
Oceania | 1 | 4.5 |
>1 world region | 6 | 27.3 |
Sample agea | ||
Adolescent & young adult (11–26 years) | 8 | 36.4 |
Adult (>18 years) | 3 | 13.6 |
Adolescent and adult (>12 years) | 11 | 50.0 |
Sample sizea | ||
1,000–9,999 | 4 | 18.2 |
10,000–19,999 | 2 | 9.1 |
20,000–49,999 | 2 | 9.1 |
50,000–99,999 | 7 | 31.8 |
>100,000 | 6 | 27.3 |
Time frameb | ||
Past month | 1 | 4.5 |
Past 12 months | 5 | 22.7 |
Lifetime | 12 | 54.5 |
Multiple | 4 | 18.2 |
Summary groupings are presented here. However, estimates included in meta-analysis coded country, sample age, and size specific to each estimate. Sample size and age were not reported by all studies.
For some studies, assessment time frame varied by survey year, country, or indicator measured. Estimates included in meta-analysis coded time frame specific to each estimate. Assessment time frame was not reported by all studies.