| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 1961 |
98.6%
|
| 2 | Once | 3 |
0.2%
|
| 3 | More than once | 1 |
0.1%
|
| 4 | Not applicable | 19 |
1%
|
| Sysmiss | 4 |