| Age group (years) | Case | control | |||
| Frequency | Percent (%) | Frequency | Percent (%) | ||
|
| 0 - 9 | 1 | 2.6 | 1 | 1.9 |
| 10 - 19 | 2 | 5.3 | 7 | 13.0 | |
| 20 - 29 | 13 | 34.2 | 13 | 24.1 | |
| 30 - 39 | 10 | 26.3 | 8 | 14.8 | |
| 40 - 49 | 6 | 15.8 | 8 | 14.8 | |
| 50 - 59 | 3 | 7.9 | 14 | 25.9 | |
| 60 - 69 | 3 | 7.9 | 3 | 5.6 | |
| Total | 38 | 100.0 | 54 | 100.0 | |