Adjusted odds ratios (aOR)* for the relationship between committing an infraction and helmet use stratified by severity of the crash and location of the injuries
| Infractions not accompanied by speed related infractions | Excessive or dangerous speed | Both | |||||
|---|---|---|---|---|---|---|---|
| Variable of stratification | Categories | aOR | 95% CI | aOR | 95% CI | aOR | 95% CI |
| *Reference category: no infractions. Other variables included in the model: age, sex, psychophysical circumstances, administrative infraction, reason for travelling, physical disabilities, nationality, type of road, light conditions, shoulder, place of the accident, condition of the road surface, visibility restricted by buildings, visibility restricted by terrain, other danger, type of accident. | |||||||
| †aOR estimate could not be obtained for this category because of small sample size. | |||||||
| Severity of the crash | Only minor injuries | 0.60 | 0.54 to 0.68 | 0.98 | 0.50 to 1.91 | 0.97 | 0.73 to 1.28 |
| Severe injuries without any deaths | 0.61 | 0.52 to 0.71 | 1.08 | 0.46 to 2.57 | 0.97 | 0.69 to 1.37 | |
| At least one death | 0.61 | 0.39 to 0.94 | –† | 0.17 | 0.39 to 0.70 | ||
| Location of the injury | Head/face/neck | 0.65 | 0.54 to 0.78 | 1.12 | 0.47 to 2.67 | 0.93 | 0.63 to 1.38 |
| Other parts of the body | 0.62 | 0.55 to 0.69 | 0.94 | 0.45 to 1.97 | 1.10 | 0.82 to 1.47 | |
| None/unknown | 0.65 | 0.51 to 0.81 | 0.84 | 0.17 to 4.10 | 1.03 | 0.58 to 1.85 | |