| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1940 |
97.6%
|
| 2 | Once | 26 |
1.3%
|
| 3 | More than once | 7 |
0.4%
|
| 4 | Not applicable | 12 |
0.6%
|
| Sysmiss | 3 |