Age group | Number of respondents | Missing values* | Dependent variable (trivial injuries) | Independent variable (km travelled by bicycle/year) | |||
Total | Mean | SD | Mean | SD | |||
15–24 | 3697 | 54 | 99 | 0.027 | 0.18 | 1540 | 2786 |
25–64 | 37 338 | 1475 | 346 | 0.010 | 0.11 | 1131 | 1918 |
65 | 10 745 | 990 | 97 | 0.010 | 0.11 | 1311 | 2634 |
Total | 51 779 | 2518 | 542 | 0.011 | 0.12 | 1197 | 2154 |
↵* Respondents who replied that they never use a bicycle and those who did not answer the question on exposure or crash involvement were treated as missing values.
PRRSS, Periodic Regional Road Safety Survey.