Table 2.
Changes in marijuana use marijuana-related perceptions and substance use among Colorado high school students before and after implementation of retail marijuana sales
| 2013 % (95% CI) |
2015 % (95% CI) |
The Rao-Scott X2 | p value | |
|---|---|---|---|---|
| Marijuana use | ||||
| Any lifetime use | 38.5 (37.0–40.0) | 38.0 (36.0–40.0) | 0.11 | 0.74 |
| Any past 30-day use | 20.9 (19.8–22.0) | 21.2 (19.8–22.7) | 0.07 | 0.79 |
| Among those reporting past 30-day use | ||||
| Frequent use | 33.2 (30.8–35.5) | 26.8 (24.0–29.5) | 8.46 | <0.01 |
| Use on school property | 5.7 (05.1–06.3) | 4.4 (03.6–05.2) | 4.90 | 0.03 |
| Marijuana-related perceptions | ||||
| High perceived accessibility | 55.8 (54.1–57.4) | 55.7 (53.6–57.8) | 0.0 | 0.98 |
| High perceived wrongfulness | 59.3 (57.6–61.0) | 60.6 (58.5–62.7) | 0.61 | 0.44 |
| High perceived parent disapproval | 85.3 (84.0–86.7) | 85.4 (84.0–86.8) | 0.0 | 0.98 |
| High perceived harmfulness | 52.9 (51.4–54.4) | 47.7 (45.5–49.9) | 11.26 | <0.01 |
| Other substance use | ||||
| Cigarette use, past 30-day | 12.1 (11.0–13.2) | 8.6 (07.7–09.5) | 17.48 | <0.01 |
| Alcohol use, past 30-day | 31.9 (30.4–33.3) | 30.2 (28.3–32.1) | 1.33 | 0.25 |
| Prescription drug misuse, lifetime | 14.5 (13.6–15.5) | 13.7 (11.8–15.5) | 0.46 | 0.50 |
| Cocaine use, lifetime | 6.8 (06.0–07.5) | 5.6 (04.8–06.4) | 3.02 | 0.08 |