Prevalence of helmet use (%) in 2001, 2002 and 2003 by education and proportion of days skied/snowboarded
| Predictor | 2001 | 2002 | 2003 |
|---|---|---|---|
| Education | |||
| High school graduate or less | 6.9 | 18.5 | 20.7 |
| Some college education | 13.6 | 20.3 | 20.4 |
| College graduate | 12.5 | 20.9 | 24.7 |
| Proportion of days skied or snowboarded | |||
| 1st quartile | 1.9 | 5.6 | 7.1 |
| 2nd quartile | 5.4 | 11.3 | 15.5 |
| 3rd quartile | 14.6 | 23.1 | 31.6 |
| 4th quartile | 27.6 | 38.4 | 38.4 |