Agreement between risk factor information from ski patrol accident report forms and follow up mail questionnaires or telephone interviews
| Risk factor | Mail questionnaire | Telephone interview | |||
|---|---|---|---|---|---|
| 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 | 0.64 (0.62 to 0.66)† | Substantial | 0.55 (0.51 to 0.59)† | Moderate | |
| Age | 0.99 (0.98 to 0.99)† | Almost perfect | 0.98 (0.96 to 0.99)† | Almost perfect | |
| Skiing time on day of injury | 0.48 (0.45 to 0.50)† | Moderate | 0.36 (0.30 to 0.41)† | Fair | |
| Lessons | 0.66 (0.63 to 0.68) | Substantial | 0.58 (0.51 to 0.64) | Moderate | |
| Type of practice | 0.64 (0.61 to 0.67) | Substantial | 0.67 (0.62 to 0.72) | Substantial | |
| Helmet use at time of injury | 0.89 (0.87 to 0.91) | Almost perfect | 0.85 (0.81 to 0.89) | Almost perfect | |
| Hill difficulty | 0.49 (0.47 to 0.52)† | Moderate | 0.40 (0.35 to 0.45)† | Fair/moderate | |