| Value | Category | Cases | |
|---|---|---|---|
| 0 | none | 4 |
0%
|
| 6 | 1 |
0%
|
|
| 9 | 1 |
0%
|
|
| 17 | 1 |
0%
|
|
| 98 | does not remember | 0 |
0%
|
| Sysmiss | 11998 |