| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 3372 |
51.3%
|
| 2 | MORE THAN ONCE | 1073 |
16.3%
|
| 9 | NO RESPONSE | 159 |
2.4%
|
| Sysmiss | 1972 |
30%
|