| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 52 |
2.2%
|
| 2 | Once a term | 20 |
0.8%
|
| 3 | Once a month | 32 |
1.3%
|
| 4 | Once a week | 497 |
20.9%
|
| 5 | Nearly every day | 1271 |
53.4%
|
| 98 | Other | 0 |
0%
|
| 99 | No books | 508 |
21.3%
|
| Sysmiss | 947 |