| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 3258 |
50.3%
|
| 2 | MORE THAN ONCE | 96 |
1.5%
|
| 9 | NO RESPONSE | 7 |
0.1%
|
| Sysmiss | 3122 |
48.2%
|