Table 1.
Prevalence of cannabis, alcohol and tobacco use among 8th to 12th grade secondary school students in Chile: data from nationwide school-based surveys between 2003 and 2017.
| Year | 2003 | 2005 | 2007 | 2009 | 2011 | 2013 | 2015 | 2017 |
|---|---|---|---|---|---|---|---|---|
| Number of participants | 58,192 | 59,689 | 50,914 | 47,528 | 33,172 | 57,641 | 54,084 | 55,197 |
| Boys (%) | 49.3 | 49.1 | 49.1 | 48.6 | 49.4 | 49.3 | 50.0 | 49.9 |
| Age (years ± SD) | 15.6 ± 1.6 | 15.2 ± 1.6 | 15.4 ± 1.5 | 15.5 ± 1.6 | 15.5 ± 1.6 | 15.6 ± 1.6 | 15.6 ± 1.6 | 15.5 ± 1.6 |
| School funding | ||||||||
| Private (%) | 22.3 | 15.7 | 12.2 | 14.2 | 23.3 | 16.9 | 15.8 | 17.5 |
| Public and private (%) | 39.7 | 42.4 | 39.6 | 36.7 | 32.8 | 38.8 | 40.0 | 43.9 |
| Public (%) | 38.0 | 42.0 | 48.2 | 49.1 | 43.9 | 44.3 | 44.2 | 38.5 |
| Cannabis use in the past year (%) | 13.6 | 14.2 | 15.3 | 14.9 | 17.9 | 29.0 | 33.4 | 31.1 |
| (95% CI) | (13.4–13.9) | (14.0–14.5) | (15.0–15.6) | (14.6–15.2) | (17.5–18.3) | (28.6–29.3) | (32.6–33.4) | (29.8–30.6) |
| Alcohol use in the past month (%) | 55.1 | 41.8 | 47.3 | 45.6 | 43.7 | 44.2 | 44.3 | 39.7 |
| (95% CI) | (54.6–55.5) | (41.4–42.2) | (46.9–47.8) | (45.1–46.0) | (43.1–44.2) | (43.8–44.6) | (43.9–44.8) | (39.3–40.1) |
| Tobacco use in the past month (%) | 48.3 | 39.3 | 39.8 | 39.2 | 29.2 | 30.3 | 28.4 | 23.2 |
| (95% CI) | (47.9–48.7) | (38.9–39.7) | (39.4–40.2) | (38.8–39.7) | (28.7–29.7) | (29.9–30.6) | (28–28.8) | (22.8–23.5) |