| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3144 |
99.8%
|
| 1 | Once | 2 |
0.1%
|
| 2 | More than once | 2 |
0.1%
|
| 3 | Not applicable | 1 |
0%
|
| Sysmiss | 1 |