| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 3003 |
54.5%
|
| 2 | MORE THAN ONCE | 207 |
3.8%
|
| 9 | NO RESPONSE | 6 |
0.1%
|
| Sysmiss | 2297 |
41.7%
|