| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 0 |
0%
|
| 2 | 1 or 2 books | 3 |
8.3%
|
| 3 | 3 to 9 books | 6 |
16.7%
|
| 4 | 10 or more books | 27 |
75%
|
| Sysmiss | 854 |