Table 1

 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 factorκ (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 ability0.62 (0.61 to 0.64)†Substantial
Age0.98 (0.98 to 0.99)†Almost perfect
Skiing time on day of injury0.45 (0.43 to 0.48)†Moderate
Lessons0.64 (0.61 to 0.67)Substantial
Type of practice0.65 (0.62 to 0.68)Substantial
Helmet use at time of injury0.88 (0.87 to 0.90)Almost perfect
Hill difficulty0.47 (0.45 to 0.50)†Moderate