| Value | Category | Cases | |
|---|---|---|---|
| 1 | ONLY ONCE | 1623 |
55.4%
|
| 2 | MORE THAN ONCE | 52 |
1.8%
|
| 9 | NO RESPONSE | 3 |
0.1%
|
| Sysmiss | 1250 |
42.7%
|