| Value | Category | 
|---|---|
| -9 | -9. Don't know | 
| -5 | -5. Refused | 
| -3 | -3. Not applicable | 
| -1 | -1. Missing | 
| 1 | 1. Professional | 
| 2 | 2. Executive/Managerial | 
| 3 | 3. Clerical/Sales | 
| 4 | 4. Tradesman/Skilled Worker | 
| 5 | 5. Semi-skilled | 
| 6 | 6. Unskilled | 
| 7 | 7. Self-employed | 
| 8 | 8. Housewife/Pensioner/Retired | 
| 9 | 9. Unemployed/Not working | 
| 10 | 10. Other |