Multiple matching OR estimates of substance use before injury, by type of substance and measurement and type of road traffic injury
| Pedestrian: multiple matching | Driver: multiple matching | Passenger: multiple matching | |||||||
| obs† | OR | 95% CI | obs† | OR | 95% CI | obs† | OR | 95% CI | |
| Alcohol | |||||||||
| Self-report | 123 | 2.67 | (0.62 to 11.50) | 657 | 5.84* | (2.77 to 12.33) | 187 | 7.26* | (2.04 to 25.86) |
| Alcosensor (BAC≥0.001) | 91 | 4.48 | (0.47 to 42.70) | 519 | 3.79* | (1.79 to 8.04) | 141 | 3.34* | (1.11 to 10.06) |
| Self-report or alcosensor | 123 | 3.31 | (0.81 to 13.54) | 657 | 6.49* | (3.10 to 13.60) | 187 | 7.92* | (2.25 to 27.92) |
| Alcosensor or SR if missing | 123 | 1.76 | (0.45 to 6.86) | 657 | 3.72* | (1.87 to 7.40) | 187 | 4.13* | (1.43 to 11.98) |
| Cannabis | |||||||||
| Self-report | 123 | 1.82 | (0.28 to 11.95) | 652 | 0.96 | (0.36 to 2.55) | 187 | 1.20 | (0.16 to 9.20) |
| Oral fluid | – | – | – | 492 | 1.04 | (0.41 to 2.60) | 138 | 0.59 | (0.05 to 7.43) |
| Self-report or oral fluid | 123 | 1.82 | (0.28 to 11.95) | 652 | 2.26 | (1.00 to 5.10) | 187 | 5.16 | (0.53 to 50.41) |
| Oral fluid or SR if missing | – | – | – | 652 | 0.94 | (0.42 to 2.13) | 187 | 2.06 | (0.33 to 13.05) |
The multiple matching estimate for pedestrian’s cannabis detection with oral fluid was not computed due to cells with zero counts.
ORs were estimated using conditional logistic regression.
*P<0.05.
†obs are the number of case and control periods used in each model (ie, each person contributed with a maximum of three observed case and control periods for the multiple matching models).
BAC, breath alcohol concentration.