| Value | Category |
|---|---|
| 0 | |
| 1 | provided by the school can take home |
| 2 | provided by the school cannot take home |
| 3 | newly purchased from the school |
| 4 | newly purchased from private market |
| 5 | gift |
| 6 | passed down from older brother/sister/family |
| 7 | purchased used |
| 8 | other |
| Sysmiss |