| Value | Category | Cases | |
|---|---|---|---|
| 0 | NONE | 330 |
24.8%
|
| 1 | ONE | 32 |
2.4%
|
| 2 | TWO | 52 |
3.9%
|
| 3 | THREE | 68 |
5.1%
|
| 4 | FOUR | 45 |
3.4%
|
| 5 | FIVE | 57 |
4.3%
|
| 6 | SIX | 44 |
3.3%
|
| 7 | SEVEN | 41 |
3.1%
|
| 8 | EIGHT | 25 |
1.9%
|
| 9 | NINE | 17 |
1.3%
|
| 10 | TEN OR MORE BOOKS | 431 |
32.4%
|
| Sysmiss | 187 |
14.1%
|