| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1915 |
96.3%
|
| 2 | Once | 27 |
1.4%
|
| 3 | More than once | 41 |
2.1%
|
| 4 | Not applicable | 2 |
0.1%
|
| Sysmiss | 3 |