Adjusted summary odds ratios for variables associated with helmet wearing in the logistic regression models
| Factor | Odds ratio | 95% Confidence interval |
|---|---|---|
| *A combined estimate has not been produced due to the significant heterogeneity of the odds ratios between 11 and 15 year olds. | ||
| Parental encouragement | 6.77 | 4.09 to 11.14 |
| Closest friend wears a helmet: age 11* | 2.80 | 2.00 to 3.92 |
| Closest friend wears a helmet: age 15* | 17.17 | 6.86 to 42.73 |
| Sometimes rides off-road | 5.69 | 3.77 to 8.62 |