| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 1073 |
49.8%
|
| 2 | MORE THAN ONCE | 246 |
11.4%
|
| 9 | NO RESPONSE | 35 |
1.6%
|
| Sysmiss | 799 |
37.1%
|