| Age category (n = 418) | Frequency (%) | ||
| Male | Female | Total | |
| £5 | 10.3 | 10.8 | 21.1 |
| 6 - 10 | 11.0 | 9.8 | 20.8 |
| 11 - 15 | 7.2 | 7.7 | 14.8 |
| 16 - 20 | 3.8 | 6.5 | 10.3 |
| 21 - 60 | 15.8 | 15.3 | 31.1 |
| >60 | 1.2 | 0.7 | 1.9 |
| Total | 49.3 | 50.7 | 100.0 |