Odds ratios and confidence intervals for the interaction between year of survey (2002 vs 2001, 2003 vs 2001) and statistically significant (p<0.05) predictors on helmet use (1 = yes; 0 = no)*
| Predictor | Estimate | p Value |
|---|---|---|
| Age | ||
| 2002 | –0.01 | 0.06 |
| 2003 | 0.01 | 0.12 |
| Equipment snowboard vs skis | ||
| 2002 | –0.01 | 0.82 |
| 2003 | –0.06 | 0.24 |
| Gender (male vs female) | ||
| 2002 | –0.06 | 0.18 |
| 2003 | 0.02 | 0.77 |
| Education | ||
| Some college vs high school, 2002 | –0.04 | 0.60 |
| College vs high school, 2002 | –0.11 | 0.09 |
| Some college vs high school, 2003 | –0.18 | 0.04 |
| College vs high school, 2003 | 0.13 | 0.09 |
| Days skied/snowboarded | ||
| 4th quartile vs 1st quartile, 2002 | 0.01 | 0.91 |
| 3rd quartile vs 1st quartile, 2002 | –0.11 | 0.12 |
| 2nd quartile vs 1st quartile, 2002 | –0.03 | 0.75 |
| 4th quartile vs 1st quartile, 2003 | –0.26 | <0.01 |
| 3rd quartile vs 1st quartile, 2003 | 0.06 | 0.45 |
| 2nd quartile vs 1st quartile, 2003 | 0.18 | 0.07 |