| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 4431 |
98.3%
|
| 2 | Once | 21 |
0.5%
|
| 3 | More than once | 2 |
0%
|
| 4 | Not applicable | 36 |
0.8%
|
| Sysmiss | 16 |