| Value | Category |
|---|---|
| -4 | missing data |
| -3 | refuse to answer |
| -2 | not applicable |
| -1 | do not know |
| 1 | books too expensive |
| 2 | books not provided by school |
| 3 | books not available |
| 4 | parents did not provide money |
| 5 | shortage of books |
| 6 | no photo copy machine |
| 7 | books mostly damaged |
| 8 | due to theft |
| 9 | books not required |
| 10 | lost books |
| 11 | registered late at school |