| Value | Category | 
|---|---|
| 01 | Employers and managers | 
| 02 | Higher professional | 
| 03 | Lower professional | 
| 04 | Non-manual | 
| 05 | Manual skilled | 
| 06 | Semi-skilled | 
| 07 | Unskilled | 
| 08 | Own account workers | 
| 09 | Farmers | 
| 10 | Agricultural workers | 
| 11 | All others gainfully occupied and unknown | 
| 99 | NIU (not in universe) |