| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3116 |
98.9%
|
| 1 | Once | 20 |
0.6%
|
| 2 | More than once | 13 |
0.4%
|
| 3 | Not applicable | 0 |
0%
|
| Sysmiss | 1 |