| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 48 |
2%
|
| 2 | Once a term | 10 |
0.4%
|
| 3 | Once a month | 33 |
1.4%
|
| 4 | Once a week | 329 |
13.8%
|
| 5 | Nearly every day | 1112 |
46.7%
|
| 98 | Other | 0 |
0%
|
| 99 | No books | 848 |
35.6%
|
| Sysmiss | 947 |