Variable | Coefficient | SE | p Value | Adjusted OR (with 95% CI) |
---|---|---|---|---|
*Reference category. | ||||
Intercept 1 | −2.435 | 0.6925 | <0.01 | 0.09 (0.02 to 0.34) |
Intercept 2 | −1.880 | 0.6924 | <0.01 | 0.15 (0.04 to 0.59) |
Intercept 3 | −1.079 | 0.6634 | 0.10 | 0.34 (0.09 to 1.25) |
Age group (years) | ||||
<12 | 0.700 | 0.294 | 0.02 | 2.01 (1.13 to 3.59) |
12–15* | 0 | 0 | 1.0 | |
Gender | ||||
Male | 0.195 | 0.292 | 0.50 | 1.21 (0.68 to 2.15) |
Female* | 0 | 0 | 1.0 | |
State helmet law | ||||
Yes | 0.973 | 0.367 | <0.01 | 2.65 (1.29 to 5.44) |
No* | 0 | 0 | 1.0 | |
Riding hours per month | 0.0079 | 0.0028 | <0.01 | 1.008 (1.002 to 1.014) |
Region | ||||
Northeast | −0.823 | 0.519 | 0.11 | 0.44 (0.16 to 1.21) |
Midwest | −0.522 | 0.484 | 0.28 | 0.59 (0.23 to 1.53) |
South | −1.101 | 0.435 | 0.01 | 0.33 (0.14 to 0.78) |
West* | 0 | 0 | 1.0 | |
Education | ||||
High school or less* | 0 | 0 | 1.0 | |
Some college | 1.105 | 0.329 | <0.01 | 3.02 (1.58 to 5.76) |
College graduate | 1.268 | 0.553 | 0.02 | 3.55 (1.20 to 10.53) |
Household income ($) | ||||
<15000* | 0 | 0 | 1.0 | |
15000 to <30000 | 0.896 | 0.512 | 0.08 | 2.45 (0.90 to 6.69) |
30000 to <45000 | 1.488 | 0.524 | <0.01 | 4.43 (1.58 to 12.38) |
≥45000 | 1.734 | 0.462 | <0.01 | 5.66 (2.29 to 14.00) |
n=259, χ2=67.6 |