| Age range (years) | n | % |
| 12 - 20 | 17 | 17 |
| 21 - 30 | 28 | 28 |
| 31 - 40 | 8 | 8 |
| 41 - 50 | 22 | 22 |
| 51 - 60 | 17 | 17 |
| 61 - 70 | 5 | 5 |
| >70 | 3 | 3 |
| Total | 100 | 100 |