| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1953 |
98.2%
|
| 2 | Once | 6 |
0.3%
|
| 3 | More than once | 6 |
0.3%
|
| 4 | Not applicable | 18 |
0.9%
|
| Sysmiss | 5 |