| Value | Category | Cases | |
|---|---|---|---|
| 0 | NONE | 207 |
34.2%
|
| 1 | ONE | 8 |
1.3%
|
| 2 | TWO | 17 |
2.8%
|
| 3 | THREE | 4 |
0.7%
|
| 4 | FOUR | 3 |
0.5%
|
| 5 | FIVE | 7 |
1.2%
|
| 6 | SIX | 4 |
0.7%
|
| 7 | SEVEN | 6 |
1%
|
| 10 | TEN OR MORE BOOKS | 15 |
2.5%
|
| Sysmiss | 335 |
55.3%
|