Multinomial logistic regression of driving under the influence of cannabis 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 DUIC n = 14 147 | RR (95% CI) | Adjusted RR* (95% CI) | |||
|---|---|---|---|---|---|---|
| No. | Weighted %† | DUIC in past 30 days v. never | DUIC more than 30 days ago v. never | DUIC in past 30 days v. never | DUIC more than 30 days ago v. never | |
| Perceived risk of regular cannabis use | ||||||
| No risk (reference) | 2061 | 12.1 | 1.00 | 1.00 | 1.00 | 1.00 |
| Slight risk | 2430 | 15.7 | 0.54 (0.39–0.75) | 0.65 (0.49–0.85) | 0.56 (0.39–0.80) | 0.67 (0.51–0.88) |
| Moderate risk | 3458 | 25.3 | 0.17 (0.13–0.22) | 0.30 (0.23–0.39) | 0.19 (0.14–0.27) | 0.34 (0.26–0.44) |
| Great risk | 5205 | 41.4 | 0.05 (0.03–0.08) | 0.09 (0.06–0.12) | 0.06 (0.04–0.10) | 0.11 (0.08–0.15) |
| Don’t know or not stated | 993 | 5.5 | NA | NA | NA | NA |
| Sex | ||||||
| Female (reference) | 7126 | 49.2 | 1.00 | 1.00 | 1.00 | 1.00 |
| Male | 7021 | 50.8 | 2.17 (1.56–3.02) | 1.80 (1.39–2.33) | 1.74 (1.25–2.41) | 1.50 (1.17–1.93) |
| School grade | ||||||
| 11 (reference) | 8043 | 51.2 | 1.00 | 1.00 | 1.00 | 1.00 |
| 12 | 6104 | 48.8 | 1.91 (1.48–2.47) | 1.86 (1.44–2.39) | 1.91 (1.51–2.42) | 1.83 (1.42–2.36) |
| Rural setting | ||||||
| No (reference) | 10 516 | 82.6 | 1.00 | 1.00 | 1.00 | 1.00 |
| Yes | 3631 | 17.4 | 2.17 (1.59–2.95) | 1.72 (1.12–2.65) | 1.70 (1.30–2.24) | 1.24 (0.90–1.71) |
| Province | ||||||
| Ontario (reference) | 3475 | 51.7 | 1.00 | 1.00 | 1.00 | 1.00 |
| Quebec | 670 | 9.8 | 0.66 (0.34–1.30) | 0.72 (0.37–1.40) | 1.59 (0.81–3.13) | 1.50 (0.78–2.89) |
| British Columbia | 1882 | 14.0 | 1.36 (0.78–2.37) | 1.58 (0.86–2.89) | 1.25 (0.72–2.17) | 1.51 (0.81–2.84) |
| Alberta | 2533 | 12.0 | 1.70 (1.12–2.57) | 2.16 (1.32–3.53) | 1.37 (0.99–1.91) | 1.90 (1.23–2.95) |
| Saskatchewan | 788 | 3.5 | 3.08 (1.94–4.88) | 3.55 (2.19–5.74) | 2.10 (1.34–3.29) | 2.91 (1.82–4.67) |
| Manitoba | 962 | 4.5 | 1.47 (0.94–2.31) | 2.32 (1.41–3.81) | 1.04 (0.74–1.47) | 1.88 (1.20–2.96) |
| Nova Scotia | 1033 | 2.7 | 3.39 (2.41–4.77) | 3.61 (2.32–5.60) | 2.59 (1.88–3.58) | 2.89 (1.90–4.39) |
| Prince Edward Island | 1103 | 0.4 | 2.13 (1.29–3.51) | 2.44 (1.50–3.97) | 1.44 (1.07–1.93) | 2.02 (1.23–3.31) |
| Newfoundland and Labrador | 1701 | 1.4 | 2.28 (1.39–3.74) | 2.67 (1.71–4.16) | 1.82 (1.14–2.89) | 2.22 (1.45–3.43) |
| Square transformation of autonomy score | ||||||
| High (reference) | 2536 | 18.4 | 1.00 | 1.00 | 1.00 | 1.00 |
| Moderate | 3864 | 29.0 | 1.09 (0.75–1.58) | 1.15 (0.87–1.52) | 0.99 (0.69–1.43) | 1.05 (0.78–1.40) |
| Low | 3317 | 23.4 | 1.05 (0.72–1.54) | 1.44 (1.04–2.01) | 0.87 (0.58–1.30) | 1.21 (0.88–1.68) |
| Very low | 4430 | 29.2 | 1.91 (1.27–2.87) | 1.76 (1.30–2.39) | 1.39 (0.90–2.14) | 1.37 (1.02–1.84)§ |
| F statistic | F(36–464) = 48.13, p < 0.001 | |||||
Note: CI = confidence interval, DUIC = driving under the influence of cannabis, NA = not applicable, RR = relative risk.
↵* 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 14 147 cases.