| Value | Category | 
|---|---|
| 1 | 1. 16 - 17 years | 
| 2 | 2. 18 - 19 years | 
| 3 | 3. 20 - 24 years | 
| 4 | 4. 25 - 29 years | 
| 5 | 5. 30 - 34 years | 
| 6 | 6. 35 - 39 years | 
| 7 | 7. 40 - 44 years | 
| 8 | 8. 45 - 49 years | 
| 9 | 9. 50 - 54 years | 
| 10 | 10. 55 - 59 years | 
| 11 | 11. 60 - 64 years | 
| 12 | 12. 65 + years | 
| 13 | 13. Refused |