| Value | Category | Cases | |
|---|---|---|---|
| 1 | no | 3771 |
73.9%
|
| 2 | Once | 9 |
0.2%
|
| 3 | More than once | 29 |
0.6%
|
| 4 | Not applicable | 1294 |
25.3%
|
| Sysmiss | 2 |