Significant factors associated with the injury rate
| Relative risk (95% confidence interval) | ||||
|---|---|---|---|---|
| Overall injury | New injury | |||
| Risk factor | Men | Women | Men | Women |
| BMI, Body mass index. | ||||
| Age (years) | ||||
| Less than 31 | – | – | – | 0.575 (0.342 to 0.967) |
| 31 to 37 | – | – | – | – |
| 38 to 43 | – | – | – | – |
| 44 to 50 | – | – | – | – |
| Greater than 50 | – | 1.919 (1.107 to 3.328) | – | – |
| BMI (kg/m2) | ||||
| Less than 21 | – | – | – | – |
| 21 to 24 | – | – | – | – |
| 24 to 26 | – | – | – | – |
| Greater than 26 | 0.407 (0.211 to 0.785) | – | – | – |
| Running frequency | ||||
| 1 day/week | – | 3.648 (1.082 to 12.297) | – | – |
| 2 days/week | – | – | – | – |
| 3 days/week | – | – | – | – |
| 4 days/week | – | – | – | – |
| 5 days/week | – | – | – | – |
| Arch height | ||||
| Normal | – | – | – | – |
| Low | – | – | – | – |
| High | – | – | – | – |
| Running surface | ||||
| Road | – | – | – | – |
| Trail | – | – | – | – |
| Grass | – | – | – | – |
| Treadmill | – | – | – | – |
| Running shoe age | ||||
| 1–3 months | – | – | – | 0.611 (0.378 to 0.987) |
| 4–6 months | 0.355 (0.151 to 0.834) | 1.735 (1.009 to 2.984) | – | – |
| 7–12 months | – | – | – | – |
| 1–2 years | – | – | – | – |
| Previous activity | – | – | – | – |
| Cross training | – | – | – | – |