Baseline demographic characteristics of the intervention and control groups
| Characteristic | Mean (SD) proportion in intervention group (n=73) | Mean (SD) proportion in control group (n=68) | p Value |
|---|---|---|---|
| Age 9 years | 0.57 (0.11) | 0.47 (0.02) | 0.213 |
| Female | 0.51 (0.02) | 0.45 (0.05) | 0.109 |
| Bicycle owner | 0.97 (0.03) | 1.00 (0.00) | 1.000 |
| Helmet owner | 0.98 (0.03) | 0.98 (0.04) | 0.968 |
| Helmet use always | 0.88 (0.05) | 0.87 (0.11) | 0.935 |