| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 5379 |
63.2%
|
| 2 | MORE THAN ONCE | 192 |
2.3%
|
| 9 | NO RESPONSE | 13 |
0.2%
|
| Sysmiss | 2927 |
34.4%
|