| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 8426 |
58.9%
|
| 2 | MORE THAN ONCE | 1510 |
10.6%
|
| 9 | NO RESPONSE | 6 |
0%
|
| Sysmiss | 4355 |
30.5%
|