| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 4457 |
98.9%
|
| 2 | Once | 8 |
0.2%
|
| 3 | More than once | 2 |
0%
|
| 4 | Not applicable | 20 |
0.4%
|
| Sysmiss | 19 |