Table 3.
Changes in past 30-day marijuana use among Colorado high school students before and after implementation of retail marijuana sales, stratified by demographic and school characteristics
| 2013 % (95% Cl) |
2015 % (95% Cl) |
The Rao-Scott X2 | p value | |
|---|---|---|---|---|
| Respondents | ||||
| Total | 20.9 (19.8–22.0) | 21.2 (19.8–22.7) | 0.07 | 0.79 |
| Sex | ||||
| Boys | 23.0 (21.6–24.5) | 21.4 (19.6–23.2) | 1.38 | 0.24 |
| Girls | 18.7 (17.5–19.9) | 21.0 (19.3–22.6) | 3.77 | 0.05 |
| Race/ethnicity | ||||
| White | 18.2 (16.8–19.6) | 19.5 (17.6–21.4) | 0.81 | 0.37 |
| Black | 26.0 (22.2–29.7) | 22.7 (18.8–26.6) | 0.99 | 0.32 |
| Hispanic/Latino | 25.7 (23.9–27.5) | 25.6 (23.7–27.5) | 0 | 0.97 |
| Other | 16.7 (14.4–19.0) | 15.7 (12.9–18.6) | 0.20 | 0.66 |
| Grade | ||||
| 9th | 14.2 (12.7–15.7) | 12.4 (10.0–14.7) | 1.07 | 0.30 |
| 10th | 19.8 (18.5–21.2) | 18.8 (16.3–21.3) | 0.39 | 0.53 |
| 11th | 23.6 (22.0–25.3) | 26.3 (23.8–28.7) | 2.21 | 0.14 |
| 12th | 26.1 (24.1–28.0) | 27.8 (24.2–31.5) | 0.53 | 0.47 |
| Schools | ||||
| Family poverty | ||||
| High (> 75%) | 27.8 (23.2–32.4) | 29.3 (25.2–33.4) | 0.16 | 0.69 |
| Low (< 75%) | 20.2 (19.0–21.5) | 20.6 (19.1–22.2) | 0.12 | 0.73 |
| Black/Hispanic student enrollment | ||||
| High (> 40%) | 26.3 (23.6–28.9) | 24.5 (22.4–26.5) | 0.80 | 0.37 |
| Low (< 40%) | 18.2 (16.9–19.5) | 19.6 (17.6–21.6) | 0.94 | 0.33 |
| Urbanicity | ||||
| Urban | 21.1 (19.4–22.9) | 22.4 (20.4–24.5) | 0.62 | 0.43 |
| Suburban | 20.4 (18.0–22.8) | 20.0 (17.2–22.9) | 0.03 | 0.86 |
| Rural | 21.5 (18.0–25.0) | 21.3 (19.2–23.4) | 0 | 0.93 |
| Retail marijuana sales in 2015 | ||||
| Yes | 23.9 (22.1, 25.7) | 23.4 (21.5, 25.3) | 0.11 | 0.74 |
| No | 18.8 (16.9, 20.7) | 19.3 (16.9, 21.8) | 0.09 | 0.76 |
The mean prevalence of past 30-day marijuana use across schools was 22.1% in 2013 (SD = 11.4%) and 22.7% (SD = 14.1) in 2015