| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 54 |
2.7%
|
| 2 | Once a term | 12 |
0.6%
|
| 3 | Once a month | 8 |
0.4%
|
| 4 | Once a week | 544 |
26.9%
|
| 5 | Nearly every day | 1339 |
66.2%
|
| 98 | Other | 67 |
3.3%
|
| 99 | No books | 0 |
0%
|
| Sysmiss | 1303 |