| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 4449 |
98.7%
|
| 2 | Once | 7 |
0.2%
|
| 3 | More than once | 0 |
0%
|
| 4 | Not applicable | 32 |
0.7%
|
| Sysmiss | 18 |