Agreement between information on risk factors from ski patrols’ accident report forms and follow up mail questionnaires or telephone interviews for cases and injured controls
| Risk factor | Head, face, or neck injury | Injured controls | |||
|---|---|---|---|---|---|
| κ (95% CI) | Agreement rating* | κ (95% CI) | 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 | 0.61 (0.57 to 0.64)† | Substantial | 0.63 (0.61 to 0.64)† | Substantial | |
| Age | 0.98 (0.97 to 0.99)† | Almost perfect | 0.98 (0.98 to 0.99)† | Almost perfect | |
| Skiing time on day of injury | 0.42 (0.37 to 0.47)† | Moderate | 0.46 (0.43 to 0.49)† | Moderate | |
| Lessons received | 0.63 (0.58 to 0.69) | Substantial | 0.64 (0.61 to 0.67) | Substantial | |
| Type of practice | 0.62 (0.56 to 0.68) | Substantial | 0.66 (0.63 to 0.69) | Substantial | |
| Helmet use at time of injury | 0.93 (0.90 to 0.95) | Almost perfect | 0.87 (0.85 to 0.88) | Almost perfect | |
| Hill difficulty | 0.45 (0.41 to 0.50)† | Moderate | 0.48 (0.45 to 0.50)† | Moderate | |