| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 1443 |
45.7%
|
| 2 | MORE THAN ONCE | 304 |
9.6%
|
| 9 | NO RESPONSE | 13 |
0.4%
|
| Sysmiss | 1397 |
44.3%
|