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.