| Value | Category | Cases | |
|---|---|---|---|
| 1 | no | 3637 |
71.2%
|
| 2 | Once | 14 |
0.3%
|
| 3 | More than once | 33 |
0.6%
|
| 4 | Not applicable | 1419 |
27.8%
|
| Sysmiss | 2 |