Pre- versus post-legislation bicycle helmet prevalence ratios by age and location
| Variable | 2004 v 2000 adjusted* prevalence ratio (cluster adjusted 95% CI) |
|---|---|
| *Poisson regression model with adjustment for clustering by site contained terms for age, date, sex, average annual income, location, and the interaction of date and location and date and age; complete case analysis based on 890 subjects (970 total subjects less 80 subjects missing data for age or sex or both). | |
| Age | |
| <18 | 3.69 (2.65–5.14) |
| 18+ | 1.17 (0.95–1.43) |
| Location | |
| Commuter route | 1.17 (0.95–1.43) |
| Campus | 0.74 (0.49–1.11) |
| Residential | 1.49 (1.14–1.96) |
| Cycling path | 0.75 (0.51–1.10) |
| Park | 0.78 (0.58–1.05) |