| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 1023 |
35.1%
|
| 2 | MORE THAN ONCE | 416 |
14.3%
|
| 9 | NO RESPONSE | 13 |
0.4%
|
| Sysmiss | 1464 |
50.2%
|