Agreement between information on risk factors from ski patrol accident report forms and follow up mail questionnaires or telephone interviews for all injured people
| Risk factor | κ (95% confidence interval) | Agreement rating* |
|---|---|---|
| *Based on Landis and Koch criteria for agreement (0 = poor; 0–0.2 = slight; 0.2–0.4 = fair; 0.4–0.6 = moderate; 0.6–0.8 = substantial; 0.8–1 = almost perfect).18 | ||
| †Weighted κ. | ||
| Self reported ability | 0.62 (0.61 to 0.64)† | Substantial |
| Age | 0.98 (0.98 to 0.99)† | Almost perfect |
| Skiing time on day of injury | 0.45 (0.43 to 0.48)† | Moderate |
| Lessons | 0.64 (0.61 to 0.67) | Substantial |
| Type of practice | 0.65 (0.62 to 0.68) | Substantial |
| Helmet use at time of injury | 0.88 (0.87 to 0.90) | Almost perfect |
| Hill difficulty | 0.47 (0.45 to 0.50)† | Moderate |