| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 438 |
9.7%
|
| 2 | Once | 13 |
0.3%
|
| 3 | More than once | 29 |
0.6%
|
| 4 | Not applicable | 4009 |
89%
|
| Sysmiss | 17 |