| Value | Category | Cases | |
|---|---|---|---|
| 0 | NONE | 18 |
0.4%
|
| 1 | ONE | 9 |
0.2%
|
| 2 | TWO | 103 |
2.5%
|
| 3 | THREE | 140 |
3.5%
|
| 4 | FOUR | 315 |
7.8%
|
| 5 | FIVE | 430 |
10.6%
|
| 6 | SIX | 493 |
12.2%
|
| 7 | SEVEN | 295 |
7.3%
|
| 8 | EIGHT | 388 |
9.6%
|
| 10 | TEN OR MORE BOOKS | 1855 |
45.8%
|
| 99 | NO RESPONSE | 5 |
0.1%
|
| Sysmiss | 5366 |