| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 552 |
65.9%
|
| 1 | 53 |
6.3%
|
|
| 2 | 68 |
8.1%
|
|
| 3 | 55 |
6.6%
|
|
| 4 | 29 |
3.5%
|
|
| 5 | 23 |
2.7%
|
|
| 6 | 12 |
1.4%
|
|
| 7 | 1 |
0.1%
|
|
| 8 | 1 |
0.1%
|
|
| 10 | 10 or more books | 23 |
2.7%
|
| Sysmiss | 20 |
2.4%
|