| Value | Category | Cases | |
|---|---|---|---|
| 1 | no | 4040 |
79.1%
|
| 2 | Once | 9 |
0.2%
|
| 3 | More than once | 16 |
0.3%
|
| 4 | Not applicable | 1038 |
20.3%
|
| Sysmiss | 2 |