| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 3471 |
77%
|
| 2 | Once | 43 |
1%
|
| 3 | More than once | 107 |
2.4%
|
| 4 | Not applicable | 868 |
19.3%
|
| Sysmiss | 17 |