| Value | Category |
|---|---|
| 0 | Pre-school |
| 1 | Std 1 |
| 2 | Std 2 |
| 3 | Std 3 |
| 4 | Std 4 |
| 5 | Std 5 |
| 6 | Std 6 |
| 7 | Std 7 |
| 8 | Std 7 and CPE |
| 9 | Std 8 |
| 10 | Std 8 and KCPE |
| 11 | Form 1 |
| 12 | Form 2 |
| 13 | Form 2 and KJSE |
| 14 | Form 3 |
| 15 | Form 4 |
| 16 | Form 4 and KCE/KCSE |
| 17 | Form 5 |
| 18 | Form 6 |
| 19 | Form 6 and A level |
| 20 | University |
| 21 | Technical |
| 22 | Informal |
| 99 | Not stated |
| Sysmiss |