| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 2717 |
64.4%
|
| 2 | MORE THAN ONCE | 208 |
4.9%
|
| 9 | NO RESPONSE | 3 |
0.1%
|
| Sysmiss | 1291 |
30.6%
|