Table 1 Participant characteristics
Characteristic | % (n) |
|---|---|
Gender | Â |
   Male | 51.9 (2083) |
   Female | 48.1 (1930) |
Age | Â |
   15 | 20.7 (829) |
   16 | 56.2 (2255) |
   17 | 23.1 (929) |
Population density | Â |
   <5,000 | 6.1 (245) |
   <50,000 | 22.7 (910) |
   <500,000 | 29.9 (1199) |
   >500,000 | 41 (1646) |
SES a | Â |
   Non-manual | 70.7 (2802) |
   Manual | 29.3 (1211) |