Characteristics of severely or fatally injured drivers, time of crash, and passenger presence
| Characteristic | Value | Controls | Cases | Crude odds ratio | 95% CI | Adjusted odds ratio* | 95% CI |
|---|---|---|---|---|---|---|---|
| *Odds ratio obtained from logistic model containing all variables in table. | |||||||
| CI, confidence interval. | |||||||
| Driver and crash characteristics | |||||||
| Driver age | 16 | 4648 | 405 | 1.13 | 0.99 to 1.29 | 1.25 | 1.08 to 1.45 |
| 17 | 7520 | 581 | (ref) | – | (ref) | – | |
| Driver sex | Male | 6171 | 634 | 1.75 | 1.53 to 2.01 | 1.37 | 1.18 to 1.60 |
| Female | 5997 | 352 | (ref) | – | (ref) | – | |
| Driver alcohol use | Yes | 42 | 184 | 66.24 | 46.71 to 95.61 | 39.77 | 27.69 to 57.12 |
| No | 12126 | 802 | (ref) | – | (ref) | – | |
| Time of crash | 4 pm–5:59 pm | 2079 | 102 | 0.80 | 0.64 to 1.01 | 0.80 | 0.63 to 1.00 |
| 6 pm–7:59 pm | 1632 | 125 | 1.26 | 1.01 to 1.55 | 1.15 | 0.92 to 1.43 | |
| 8 pm–9:59 pm | 1162 | 96 | 1.35 | 1.06 to 1.72 | 1.11 | 0.87 to 1.43 | |
| 10 pm–11:59 pm | 770 | 120 | 2.56 | 2.03 to 3.19 | 1.84 | 1.45 to 2.35 | |
| Midnight–1:59 pm | 279 | 90 | 5.29 | 4.03 to 6.89 | 2.47 | 1.79 to 3.42 | |
| 2 am–3:59 am | 89 | 51 | 9.40 | 6.41 to 13.63 | 3.70 | 2.34 to 5.87 | |
| 4 am–5:59 am | 25 | 28 | 18.36 | 10.20 to 33.15 | 10.63 | 5.55 to 20.32 | |
| 6 am–3:59 pm | 6132 | 374 | (ref) | – | (ref) | – | |
| Passenger characteristics | No of passengers | ||||||
| Driving alone | None | 5598 | 413 | (ref) | – | (ref) | – |
| Male teenage only | 1 | 1337 | 165 | 1.67 | 1.38 to 2.03 | 1.45 | 1.18 to 1.79 |
| 2 | 411 | 51 | 1.68 | 1.21 to 2.30 | 1.17 | 0.82 to 1.68 | |
| 3 or more | 183 | 32 | 2.37 | 1.55 to 3.52 | 1.74 | 1.12 to 2.69 | |
| Female teenage only | 1 | 1533 | 97 | 0.86 | 0.68 to 1.08 | 0.92 | 0.72 to 1.17 |
| 2 | 388 | 31 | 1.08 | 0.72 to 1.59 | 1.16 | 0.78 to 1.74 | |
| 3 or more | 166 | 10 | 0.82 | 0.38 to 1.56 | 0.84 | 0.42 to 1.67 | |
| Mix of male and female teenage | 2 | 299 | 22 | 1.00 | 0.61 to 1.56 | 1.01 | 0.63 to 1.60 |
| 3 or more | 341 | 53 | 2.11 | 1.52 to 2.87 | 1.82 | 1.30 to 2.54 | |
| Young adult (ages 20–29) | 1 or more | 285 | 37 | 1.76 | 1.20 to 2.53 | 1.34 | 0.89 to 2.03 |
| Mature adult (ages 30+) | 1 or more | 572 | 11 | 0.26 | 0.13 to 0.48 | 0.28 | 0.15 to 0.53 |
| Mix of young and mature adult | 2 or more | 24 | 0 | – | – | – | – |
| Children only | 1 or more | 268 | 12 | 0.61 | 0.31 to 1.09 | 0.81 | 0.45 to 1.47 |
| Mix of teen and adults | 2 | 190 | 13 | 0.93 | 0.48 to 1.64 | 0.60 | 0.30 to 1.19 |
| 3 or more | 151 | 19 | 1.71 | 0.99 to 2.79 | 1.00 | 0.56 to 1.79 | |
| Mix of teen and children | 2 or more | 221 | 11 | 0.67 | 0.33 to 1.24 | 0.86 | 0.46 to 1.59 |
| Other mix | 2 or more | 201 | 9 | 0.61 | 0.27 to 1.19 | – | – |
| Total | – | 12168 | 986 | – | – | – | – |