Table 2.
Fatal crash counts, rates, and distance-based, time-based risk ratios for driver age category, gender, time-of-day, and day-of-week
| No. of fatal crashes | Fatal crash rate per 100 million miles driven | Distance-based risk ratio a (CI b) | Fatal crash rate per 100 million hours driven | Time-based risk ratio c (CI) | |
|---|---|---|---|---|---|
| Age category | |||||
| 16–24 | 9,263 | 4.42 | 2.43 (2.16, 2.74) | 104.59 | 2.39 (2.10, 2.72) |
| 25–44 | 17,075 | 2.17 | 1.32 (1.17, 1.48) | 60.58 | 1.31 (1.15, 1.49) |
| 45–64 | 12.805 | 1.72 | --d | 44.94 | -- |
| ≥ 65 | 6,714 | 2.39 | 1.49 (1.32, 1.68) | 60.69 | 1.50 (1.31, 1.71) |
| Gender | |||||
| Female | 13,111 | 1.51 | -- | 38.14 | -- |
| Male | 32,746 | 2.84 | 1.75 (1.61, 1.91) | 77.55 | 1./5 (1.60, 1.92) |
| Time-of-day | |||||
| Daytime | 24,011 | 1.49 | -- | 40.72 | -- |
| Nighttime | 21,846 | 5.36 | 3.13 (2.87, 3.41) | *V3.8’ | 2.83 (2.58, 3.10) |
| Day-of-week | |||||
| Weekend | 18,512 | 3.17 | -- | 82.97 | -- |
| Weekday | 27,345 | 1.90 | 0.79 (0.73, 0.86) | 50.37 | 0.76 (0.70, 0.84) |
The estimates were obtained through a negative binomial regression model with an offset equal to the natural log of the number of vehicle miles driven. The model included age category, gender, time-of-day, day-of-week, and quarter as independent variables and the number of drivers in fatal crashes as the dependent variable;
Confidence intervals;
The estimates were obtained through a negative regression model with an offset equal to the natural log of the number of vehicle hours driven. The model included age category, gender, time-of-day, day-of-week, and quarter as independent variables and the number of drivers in fatal crashes as the dependent variable;
Reference group.