| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 4426 |
98.2%
|
| 2 | Once | 22 |
0.5%
|
| 3 | More than once | 16 |
0.4%
|
| 4 | Not applicable | 24 |
0.5%
|
| Sysmiss | 18 |