Table 3: Weighted prevalence and logistic regression analysis* of variables related to the odds of driving within 2 hours of using marijuana among 10 411 grade 11-12 students.
| Variable | In last 30 d | Ever | ||
|---|---|---|---|---|
| Weighted prevalence (95% CI), % | Odds ratio (99% CI) | Weighted prevalence (95% CI), % | Odds ratio (99% CI) | |
| Canada (total) | 4.7 (3.9-5.5) | 9.4 (8.3-10.4) | ||
| Sex | ||||
| Female | 3.2 (2.1-4.3)† | 0.448 (0.240-0.834) | 7.1 (5.6-8.6) | 0.517 (0.333-0.805) |
| Male | 6.1 (4.9-7.3) | Reference | 11.5 (10.0-13.0) | Reference |
| Grade | ||||
| 11 | 3.6 (2.8-4.3) | Reference | 7.2 (6.1-8.4) | Reference |
| 12 | 6.0 (4.5-7.4) | 1.533 (0.959-2.452) | 11.6 (9.8-13.5) | 1.584 (1.072-2.339) |
| Ethnicity | ||||
| White | 4.7 (3.7-5.8) | Reference | 10.2 (8.9-11.4) | Reference |
| Black | ‡ | 2.610 (0.823-8.274) | 8.4 (3.5-13.3)† | 1.337 (0.465-3.842) |
| Asian | 2.3 (1.0-3.6)† | 0.982 (0.438-2.198) | 4.0 (2.6-5.4)† | 0.733 (0.393-1.369) |
| Latin American | ‡ | 4.189 (0.273-64.273) | ‡ | 3.698 (0.722-18.934) |
| Aboriginal | 13.2 (9.1-17.2) | 2.529 (1.244-5.143) | 23.0 (16.9-29.2) | 2.005 (1.140-3.526) |
| Other | ‡ | 1.126 (0.308-4.114) | 10.0 (4.4-15.5)† | 1.692 (0.690-4.146) |
| Province | ||||
| British Columbia | 6.9 (4.8-9.0)‡ | 1.849 (0.676-5.062) | 12.5 (8.6-16.4) | 1.757 (0.815-3.787) |
| Alberta | 3.5 (2.0-5.0)‡ | 0.992 (0.400-2.459) | 8.0 (6.2-9.8) | 1.241 (0.782-1.970) |
| Saskatchewan | 10.5 (6.0-14.9)‡ | 2.428 (1.135-5.194) | 20.0 (11.7-28.3)‡ | 2.665 (1.519-4.677) |
| Manitoba | 4.8 (3.0-6.7)‡ | 1.050 (0.435-2.534) | 14.1 (8.3-20.0)‡ | 1.757 (0.832-3.710) |
| Ontario | 3.5 (2.1-4.9)‡ | Reference | 7.2 (5.8-8.6) | Reference |
| Quebec | 3.5 (2.2-4.7)‡ | 0.850 (0.348-2.075) | 6.9 (4.7-9.0) | 0.773 (0.450-1.327) |
| Nova Scotia | 7.6 (6.5-8.6) | 1.842 (1.092-3.107) | 15.2 (13.0-17.3) | 1.867 (1.329-2.621) |
| Prince Edward Island | 10.9 (9.1-12.6) | 2.892 (1.478-5.656) | 16.3 (14.0-18.6) | 1.993 (1.375-2.888) |
| Newfoundland and Labrador | 10.1 (8.1-12.2) | 2.723 (1.476-5.023) | 18.9 (16.6-21.3) | 2.394 (1.582-3.625) |
| School socioeconomic status | ||||
| Low median | 5.0 (3.4-6.6) | Reference | 10.3 (8.2-12.4) | Reference |
| High median | 4.4 (3.4-5.4) | 0.989 (0.479-2.043) | 8.6 (7.3-9.9) | 1.037 (0.619-1.738) |
| Urban | ||||
| Yes | 4.2 (3.3-5.1) | Reference | 8.2 (7.0-9.4) | Reference |
| No | 6.8 (4.0-9.6)‡ | 1.029 (0.537-1.974) | 14.5 (11.5-17.4) | 1.228 (0.891-1.693) |
| Drinking behaviour | ||||
| Does not drink | † | Reference | † | Reference |
| Drinks but no binging | 0.7 (0.4-1.0)‡ | 0.879 (0.175-4.428) | 1.5 (0.8-2.2)‡ | 1.089 (0.366-3.244) |
| Binge drinks | 8.0 (6.7-9.2) | 10.128 (2.283-44.940) | 16.0 (14.4-17.6) | 12.934 (4.360-38.366) |
Note: CI = confidence interval.
*All logistic regressions were conducted with the use of a complete-case methods approach, so the results presented here are among all cases with complete data.
†Moderate sampling variability; interpret with caution.
‡High sampling variability/insufficient sample size; data suppressed.