| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1959 |
98.5%
|
| 2 | Once | 7 |
0.4%
|
| 3 | More than once | 3 |
0.2%
|
| 4 | Not applicable | 16 |
0.8%
|
| Sysmiss | 3 |