| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1953 |
98.2%
|
| 2 | Once | 7 |
0.4%
|
| 3 | More than once | 4 |
0.2%
|
| 4 | Not applicable | 19 |
1%
|
| Sysmiss | 5 |