| Value | Category |
|---|---|
| 1 | No formal schooling |
| 2 | less than primary school |
| 3 | primary school completed |
| 4 | secondary school completed |
| 5 | high school (or equivalent) completed |
| 6 | college / pre-university / university completed |
| 7 | post graduate deegree completed |
| Sysmiss |