Table 1.
Demographic, motorcycle and environmental sample characteristics of motorcyclists (during Songkran festival) (N = 18,998).
| Total | Non-helmet use of rider | |||
|---|---|---|---|---|
| Number | % | Number | % | |
| Demographics | ||||
| All | 18,998 | 8,369 | 44.2 | |
| Male | 12,744 | 67.3 | 5,683 | 44.7 |
| Female | 6,183 | 32.7 | 2,651 | 43.0 |
| Age (by self-report) | ||||
| <15 | 403 | 2.2 | 203 | 50.6 |
| 15–17 | 2,045 | 11.4 | 1,245 | 61.1 |
| 18–25 | 7,860 | 43.9 | 3,895 | 49.7 |
| 26–59 | 7,480 | 41.8 | 2,449 | 32.8 |
| 60 or more | 128 | 0.7 | 39 | 31.0 |
| Region | ||||
| North | 4,546 | 23.9 | 2,850 | 62.9 |
| Central | 4,663 | 24.5 | 2,003 | 43.1 |
| Northeast | 4,989 | 26.3 | 2,135 | 43.1 |
| South | 4,800 | 25.3 | 1,381 | 28.8 |
| Motorcycle and environmental characteristics | ||||
| Type of motorcycle | ||||
| 50–110 cc | 7,047 | 31.1 | 3,179 | 45.2 |
| Over 110 cc | 5,910 | 37.1 | 2,717 | 46.1 |
| Missing | 6,041 | 31.8 | ||
| Data collection time | ||||
| 07:00–09:00 | 5,557 | 29.3 | 2,308 | 41.7 |
| 13:00–15:00 | 5,790 | 30.5 | 2,619 | 45.4 |
| 17:00–19:00 | 5,688 | 30.0 | 2,524 | 44.5 |
| 22:00–24:00 | 1,943 | 10.2 | 910 | 47.1 |
| Date of data collection | ||||
| 13 April 2007 | 4,910 | 25.8 | 2,313 | 47.3 |
| 14 April | 4,616 | 24.3 | 2,068 | 44.9 |
| 15 April | 4,744 | 25.0 | 2,217 | 47.0 |
| 16 April 2007 | 4,726 | 24.9 | 1,770 | 37.6 |
| Location of data collection | ||||
| Main road in town | 6,306 | 33.2 | 2,663 | 42.4 |
| Roads out of town | 6,265 | 33.0 | 2,872 | 46.1 |
| Highway | 6,406 | 33.8 | 2,815 | 44.2 |