Multinomial logistic regression of riding with a cannabis-impaired driver among Canadian students in grades 11 and 12 who participated in the 2016–2017 Canadian Student Tobacco, Alcohol and Drugs Survey
| Variable | Respondents who reported RWCD n = 14 170 | RR (95% CI) | Adjusted RR* (95% CI) | |||
|---|---|---|---|---|---|---|
| No. | Weighted %† | RWCD in past 30 days v. never | RWCD more than 30 days ago v. never | RWCD in past 30 days v. never | RWCD more than 30 days ago v. never | |
| Perceived risk of regular cannabis use | ||||||
| No risk (reference) | 2066 | 12.0 | 1.00 | 1.00 | 1.00 | 1.00 |
| Slight risk | 2436 | 15.8 | 0.55 (0.45–0.68) | 0.84 (0.66–1.06) | 0.57 (0.46–0.69) | 0.87 (0.69–1.10) |
| Moderate risk | 3463 | 25.3 | 0.28 (0.23–0.34) | 0.51 (0.41–0.64) | 0.28 (0.23–0.35) | 0.52 (0.42–0.65) |
| Great risk | 5206 | 41.3 | 0.08 (0.06–0.11) | 0.22 (0.18–0.28) | 0.09 (0.07–0.12) | 0.24 (0.19–0.29) |
| Don’t know or not stated | 999 | 5.6 | NA | NA | NA | NA |
| Sex | ||||||
| Female (reference) | 7143 | 49.4 | 1.00 | 1.00 | 1.00 | 1.00 |
| Male | 7027 | 50.6 | 1.18 (0.98–1.44) | 0.92 (0.77–1.10) | 0.90 (0.74–1.10) | 0.77 (0.63–0.94) |
| School grade | ||||||
| 11 (reference) | 8062 | 51.2 | 1.00 | 1.00 | 1.00 | 1.00 |
| 12 | 6108 | 48.8 | 1.46 (1.16–1.85) | 1.51 (1.31–1.73) | 1.49 (1.17–1.89) | 1.60 (1.37–1.85) |
| Rural setting | ||||||
| No (reference) | 10 538 | 82.6 | 1.00 | 1.00 | 1.00 | 1.00 |
| Yes | 3632 | 17.4 | 1.62 (1.22–2.15) | 1.51 (1.05–2.17) | 1.34 (1.05–1.72) | 1.17 (0.86–1.60) |
| Province | ||||||
| Ontario (reference) | 3480 | 51.8 | 1.00 | 1.00 | 1.00 | 1.00 |
| Quebec | 672 | 9.7 | 1.01 (0.66–1.54) | 1.22 (0.88–1.68) | 1.90 (1.19–3.04) | 2.04 (1.45–2.86) |
| British Columbia | 1874 | 13.9 | 1.36 (0.91–2.04) | 1.25 (0.84–1.86) | 1.31 (0.89–1.93) | 1.26 (0.84–1.91) |
| Alberta | 2541 | 12.0 | 1.53 (1.06–2.21) | 2.19 (1.48–3.23) | 1.32 (0.98–1.76) | 2.07 (1.44–2.98) |
| Saskatchewan | 788 | 3.5 | 1.87 (1.10–3.18) | 2.74 (1.86–4.02) | 1.45 (0.82–2.57) | 2.48 (1.56–3.96) |
| Manitoba | 963 | 4.5 | 1.55 (1.06–2.26) | 1.56 (1.15–2.12) | 1.21 (0.85–1.73) | 1.40 (1.04–1.88) |
| Nova Scotia | 1043 | 2.8 | 3.52 (2.66–4.67) | 3.27 (2.54–4.20) | 2.77 (2.15–3.56) | 2.88 (2.24–3.71) |
| Prince Edward Island | 1107 | 0.4 | 1.86 (1.26–2.77) | 2.10 (1.62–2.72) | 1.49 (1.10–2.01) | 1.93 (1.40–2.67) |
| Newfoundland and Labrador | 1702 | 1.4 | 2.24 (1.69–2.96) | 2.28 (1.73–3.00) | 1.86 (1.41–2.44) | 2.09 (1.57–2.78) |
| Square transformation of autonomy score | ||||||
| High (reference) | 2545 | 18.6 | 1.00 | 1.00 | 1.00 | 1.00 |
| Moderate | 3870 | 29.0 | 1.06 (0.78–1.44) | 1.33 (1.03–1.72) | 0.95 (0.68–1.31) | 1.22 (0.93–1.60) |
| Low | 3331 | 23.4 | 1.43 (1.03–1.99) | 1.24 (0.88–1.73) | 1.25 (0.87–1.79) | 1.14 (0.82–1.58) |
| Very low | 4424 | 29.0 | 1.50 (1.14–1.98) | 1.53 (1.18–2.00) | 1.15 (0.86–1.53) | 1.32 (0.97–1.79) |
| F statistic | F(36–464) = 39.27, p < 0.001 | |||||
Note: CI = confidence interval, NA = not applicable, RR = relative risk, RWCD = riding with a cannabis-impaired driver.
↵* Adjusted for perceived risk of regular cannabis use, sex, school grade, rural setting, province and square transformation of autonomy score.
↵† The weighted prevalence estimates are based on 14 170 cases.