Crash outcomes of the baseline and follow-up cohorts
| Crash outcome | Baseline cohort | Follow-up cohort | RRF (95% CI)* | ||
|---|---|---|---|---|---|
| n | Per cent | n | Per cent | ||
| Overall crashes | |||||
| One or more | 855 | 33.0 | 553 | 36.2 | 1.10 (1.05 to 1.14) |
| None | 1732 | 67.0 | 973 | 63.8 | 0.95 (0.93 to 0.97) |
| On-road crashes | |||||
| One or more | 553 | 21.4 | 360 | 23.6 | 1.10 (1.04 to 1.16) |
| None | 2034 | 78.6 | 1166 | 76.4 | 0.97 (0.96 to 0.99) |
| Other crashes | |||||
| One or more | 427 | 16.5 | 276 | 18.1 | 1.10 (1.02 to 1.17) |
| None | 2160 | 83.5 | 1250 | 81.9 | 0.98 (0.97 to 1.00) |
| Collisions with a motor vehicle | |||||
| One or more | 104 | 4.0 | 66 | 4.3 | 1.08 (0.92 to 1.23) |
| None | 2483 | 96.0 | 1460 | 95.7 | 1.00 (0.99 to 1.00) |
*95% bootstrap CI.
RRF, ratios of relative frequencies.