| Value | Category | 
|---|---|
| 0 | no second/third problem | 
| 1 | school too far | 
| 2 | poor school building | 
| 3 | living standard of teachers is too low | 
| 4 | school budget constraint | 
| 5 | not enough places/desks | 
| 6 | not enough supplies | 
| 7 | poor quality of teachers | 
| 8 | not enough teachers | 
| 9 | classes not held regularly | 
| 10 | other | 
| 98 | don't know | 
| 99 | missing |