| Value | Category | Cases | |
|---|---|---|---|
| 1 | no | 653 |
12.8%
|
| 2 | Once | 4 |
0.1%
|
| 3 | More than once | 9 |
0.2%
|
| 4 | Not applicable | 4437 |
86.9%
|
| Sysmiss | 2 |