Table 2

 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)*

PredictorEstimatep Value
Age
    2002–0.010.06
    20030.010.12
Equipment snowboard vs skis
    2002–0.010.82
    2003–0.060.24
Gender (male vs female)
    2002–0.060.18
    20030.020.77
Education
    Some college vs high school, 2002–0.040.60
    College vs high school, 2002–0.110.09
    Some college vs high school, 2003–0.180.04
    College vs high school, 20030.130.09
Days skied/snowboarded
    4th quartile vs 1st quartile, 20020.010.91
    3rd quartile vs 1st quartile, 2002–0.110.12
    2nd quartile vs 1st quartile, 2002–0.030.75
    4th quartile vs 1st quartile, 2003–0.26<0.01
    3rd quartile vs 1st quartile, 20030.060.45
    2nd quartile vs 1st quartile, 20030.180.07