Agreement of information on risk factors from ski patrols’ accident report forms and follow up mail questionnaires or telephone interviews for those who returned the questionnaire or completed the interview <4 months or >4 months after the injury
| Risk factor | Time to completion of questionnaire or telephone interview | ||||
|---|---|---|---|---|---|
| <4 months | >4 months | ||||
| 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 | 0.63 (0.61 to 0.65)† | Substantial | 0.60 (0.57 to 0.63)† | Moderate or substantial | |
| Age | 0.99 (0.98 to 0.99)† | Almost perfect | 0.98 (0.97 to 0.99)† | Almost perfect | |
| Skiing time on day of injury | 0.47 (0.44 to 0.50)† | Moderate | 0.41 (0.37 to 0.46)† | Moderate | |
| Lessons | 0.66 (0.63 to 0.69) | Substantial | 0.60 (0.54 to 0.65) | Moderate or substantial | |
| Type of practice | 0.64 (0.61 to 0.67) | Substantial | 0.67 (0.62 to 0.71) | Substantial | |
| Helmet use at time of injury | 0.89 (0.87 to 0.91) | Almost perfect | 0.86 (0.83 to 0.89) | Almost perfect | |
| Hill difficulty | 0.49 (0.47 to 0.52)† | Moderate | 0.42 (0.38 to 0.47)† | Moderate | |