| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1937 |
97.4%
|
| 2 | Once | 21 |
1.1%
|
| 3 | More than once | 7 |
0.4%
|
| 4 | Not applicable | 20 |
1%
|
| Sysmiss | 3 |