Cycling characteristics of the baseline and follow-up cohorts
| Participant characteristics | Baseline cohort | Follow-up cohort | RRF (95% CI)* | ||
|---|---|---|---|---|---|
| n | Per cent | n | Per cent | ||
| Years of cycling | |||||
| <1 year | 204 | 7.9 | 102 | 6.7 | 0.85 (0.74 to 0.96) |
| 1–4 years | 1307 | 50.5 | 715 | 46.9 | 0.93 (0.90 to 0.96) |
| 5+ years | 1065 | 41.2 | 702 | 46.0 | 1.12 (1.08 to 1.16) |
| Missing | 11 | 0.4 | 7 | 0.5 | |
| Time spent cycling per week | |||||
| 0–3 | 708 | 27.4 | 410 | 26.9 | 0.98 (0.93 to 1.03) |
| 4–6 | 1048 | 40.5 | 626 | 41.0 | 1.01 (0.97 to 1.05) |
| 7+ | 822 | 31.8 | 485 | 31.8 | 1.00 (0.95 to 1.05) |
| Missing | 9 | 0.3 | 5 | 0.3 | |
| Ever ride off-road | |||||
| Yes | 990 | 38.3 | 602 | 39.4 | 1.03 (0.99 to 1.07) |
| No | 1583 | 61.2 | 915 | 60.0 | 0.98 (0.95 to 1.01) |
| Missing | 14 | 0.5 | 9 | 0.6 | |
| Ever ride in the dark | |||||
| Yes | 1730 | 66.9 | 1042 | 68.3 | 1.02 (1.00 to 1.04) |
| No | 851 | 32.9 | 482 | 31.6 | 0.96 (0.91 to 1.01) |
| Missing | 6 | 0.2 | 2 | 0.1 | |
| Ever ride in a bunch | |||||
| Yes | 1836 | 71.0 | 1113 | 72.9 | 1.03 (1.01 to 1.05) |
| No | 731 | 28.3 | 400 | 26.2 | 0.93 (0.88 to 0.98) |
| Missing | 20 | 0.8 | 13 | 0.9 | |
| Cycle to work at least once a week | |||||
| Yes | 770 | 29.8 | 461 | 30.2 | 1.01 (0.97 to 1.06) |
| No | 1766 | 68.3 | 1028 | 67.4 | 0.99 (0.97 to 1.01) |
| Missing | 51 | 2.0 | 37 | 2.4 | |
| Type of bike most commonly used | |||||
| Road | 2242 | 86.7 | 1323 | 86.7 | 1.00 (0.99 to 1.01) |
| Mountain | 195 | 7.5 | 107 | 7.0 | 0.93 (0.82 to 1.04) |
| Others | 138 | 5.3 | 90 | 5.9 | 1.11 (0.97 to 1.24) |
| Missing | 12 | 0.5 | 6 | 0.4 | |
| Crash in the past 12 months | |||||
| Yes | 801 | 31.0 | 482 | 31.6 | 1.02 (0.97 to 1.07) |
| No | 1781 | 68.8 | 1042 | 68.3 | 0.99 (0.97 to 1.01) |
| Missing | 5 | 0.2 | 2 | 0.1 | |
| Always wear helmet | |||||
| Yes | 2552 | 98.6 | 1506 | 98.7 | 1.00 (1.00 to 1.00) |
| No | 25 | 1.0 | 16 | 1.0 | 1.08 (0.76 to 1.41) |
| Missing | 10 | 0.4 | 4 | 0.3 | |
| Wear fluorescent colours | |||||
| Always | 758 | 29.3 | 433 | 28.4 | 0.97 (0.92 to 1.02) |
| Sometimes | 1309 | 50.6 | 808 | 52.9 | 1.05 (1.01 to 1.08) |
| Never | 499 | 19.3 | 275 | 18.0 | 0.93 (0.87 to 1.00) |
| Missing | 21 | 0.8 | 10 | 0.7 | |
| Always use lights in the dark | |||||
| Yes | 1431 | 55.3 | 877 | 57.5 | 1.04 (1.01 to 1.07) |
| No | 298 | 11.5 | 164 | 10.7 | 0.93 (0.85 to 1.02) |
| Never ride in the dark | 851 | 32.9 | 482 | 31.6 | 0.96 (0.91 to 1.01) |
| Missing | 7 | 0.3 | 3 | 0.2 | |
| Use reflective materials in the dark | |||||
| Always | 849 | 32.8 | 530 | 34.7 | 1.06 (1.01 to 1.10) |
| Sometimes | 489 | 18.9 | 304 | 19.9 | 1.05 (0.99 to 1.12) |
| Never | 386 | 14.9 | 203 | 13.3 | 0.89 (0.82 to 0.97) |
| Never ride in the dark | 851 | 32.9 | 482 | 31.6 | 0.96 (0.91 to 1.01) |
| Missing | 12 | 0.5 | 7 | 0.5 | |
| Ever listen to music while riding | |||||
| Yes | 422 | 16.3 | 218 | 14.3 | 0.88 (0.80 to 0.95) |
| No | 2151 | 83.1 | 1301 | 85.3 | 1.03 (1.01 to 1.04) |
| Missing | 14 | 0.5 | 7 | 0.5 | |
*95% bootstrap CI.
RRF, ratios of relative frequencies.