Table 5: Logistic regression analysis* of variables related to the odds of riding with a driver who had used marijuana within 2 hours of driving among 22 504 grade 9-12 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) | 9.0 (7.9-10.1) | 19.8 (18.0-21.6) | ||
| Sex | ||||
| Female | 8.9 (7.7-10.2) | 0.892 (0.627-1.269) | 19.9 (18.0-21.8) | 0.909 (0.705-1.171) |
| Male | 9.1 (7.6-10.7) | Reference | 19.6 (17.4-21.8) | Reference |
| Grade | ||||
| 9 | 4.0 (2.9-5.0) | Reference | 9.1 (6.9-11.3) | Reference |
| 10 | 6.4 (5.3-7.5) | 1.325 (0.946-1.856) | 15.5 (13.0-18.0) | 1.338 (0.942-1.900) |
| 11 | 10.6 (9.2-11.9) | 1.872 (1.196-2.929) | 22.5 (20.5-24.4) | 1.893 (1.310-2.735) |
| 12 | 15.4 (11.8-19.1) | 2.546 (1.452-4.463) | 32.4 (27.4-37.4) | 2.947 (1.873-4.638) |
| Ethnicity | ||||
| White | 10.3 (8.6-11.9) | Reference | 22.9 (20.0-25.8) | Reference |
| Black | 8.2 (4.4-12.1)† | 1.278 (0.605-2.702) | 17.0 (11.7-22.2) | 1.097 (0.599-2.011) |
| Asian | 4.3 (3.1-5.5) | 0.730 (0.499-1.069) | 8.3 (7.0-9.5) | 0.540 (0.338-0.863) |
| Latin American | 6.6 (3.5-9.8)† | 0.817 (0.336-1.987) | 23.9 (17.5-30.3) | 1.397 (0.625-3.124) |
| Aboriginal | 20.1 (16.5-23.7) | 2.068 (1.453-2.942) | 38.8 (33.0-44.6) | 1.938 (1.364-2.755) |
| Other | 7.3 (4.1-10.4)† | 0.986 (0.441-2.206) | 17.5 (11.6-23.5)† | 1.055 (0.518-2.150) |
| Province | ||||
| British Columbia | 12.8 (9.7-15.9) | 1.807 (1.054-3.098) | 24.9 (19.6-30.3) | 1.722 (1.119-2.650) |
| Alberta | 8.1 (6.6-9.6) | 1.204 (0.760-1.907) | 18.5 (16.9-20.1) | 1.336 (0.946-1.885) |
| Saskatchewan | 14.3 (8.6-20.0)† | 1.452 (0.876-2.407) | 27.1 (15.9-38.4)† | 1.319 (0.755-2.305) |
| Manitoba | 10.0 (7.2-12.9) | 1.015 (0.587-1.755) | 22.5 (16.7-28.2) | 1.139 (0.644-2.013) |
| Ontario | 7.8 (5.7-9.8) | Reference | 17.2 (14.2-20.1) | Reference |
| Quebec | 6.7 (4.5-9.0)† | 0.824 (0.503-1.351) | 17.9 (12.5-23.4)† | 0.942 (0.546-1.625) |
| Nova Scotia | 13.8 (11.9-15.7) | 1.612 (1.008-2.576) | 27.8 (25.4-30.3) | 1.706 (1.142-2.548) |
| Prince Edward Island | 15.3 (13.6-17.1) | 1.863 (1.192-2.912) | 29.2 (26.9-31.6) | 1.743 (1.181-2.571) |
| Newfoundland and Labrador | 15.9 (12.6-19.3) | 1.945 (1.104-3.427) | 31.3 (28.1-34.5) | 1.942 (1.265-2.980) |
| School socioeconomic status | ||||
| Low median | 10.1 (8.0-12.2) | Reference | 22.9 (19.2-26.6) | Reference |
| High median | 8.2 (6.7-9.6) | 1.038 (0.561-1.918) | 17.2 (14.9-19.5) | 0.948 (0.611-1.472) |
| Urban | ||||
| Yes | 8.5 (7.2-9.8) | Reference | 18.2 (16.1-20.4) | Reference |
| No | 11.1 (8.7-13.5) | 0.854 (0.607-1.202) | 25.5 (21.9-29.2) | 0.888 (0.635-1.244) |
| Drinking behaviour | ||||
| Does not drink | 1.2 (0.8-1.7)† | Reference | 3.2 (2.6-3.8) | Reference |
| Drinks but no binging | 3.3 (2.5-4.0) | 2.320 (1.451-3.710) | 9.4 (8.1-10.7) | 2.608 (1.945-3.497) |
| Binge drinks | 18.1 (16.1-20.1) | 14.173 (8.335-24.099) | 37.5 (34.5-40.5) | 13.693 (10.300-18.203) |
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.