| Value | Category |
|---|---|
| -9 | Don't know |
| -8 | Refused to answer |
| -7 | Not applicable |
| -6 | Still in process |
| -5 | Application denied |
| -4 | Skipped |
| -3 | Not provided |
| 1 | 0-3 years of education |
| 2 | 4-6 years of education |
| 3 | 7-9 years of education |
| 4 | 10-12 years of education |
| 5 | 13 years and above of education |
| Sysmiss |