| Value | Category | Cases | |
|---|---|---|---|
| 0 | NONE | 520 |
33.2%
|
| 1 | ONE | 58 |
3.7%
|
| 2 | TWO | 80 |
5.1%
|
| 3 | THREE | 80 |
5.1%
|
| 4 | FOUR | 74 |
4.7%
|
| 5 | FIVE | 69 |
4.4%
|
| 6 | SIX | 54 |
3.5%
|
| 7 | SEVEN | 56 |
3.6%
|
| 8 | EIGHT | 18 |
1.2%
|
| 9 | NINE | 13 |
0.8%
|
| 10 | TEN OR MORE BOOKS | 484 |
30.9%
|
| Sysmiss | 58 |
3.7%
|