| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 25 |
1.3%
|
| 2 | Once | 3 |
0.2%
|
| 3 | More than once | 0 |
0%
|
| 4 | Not applicable | 1957 |
98.4%
|
| Sysmiss | 3 |