| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3106 |
98.6%
|
| 1 | Once | 28 |
0.9%
|
| 2 | More than once | 14 |
0.4%
|
| 3 | Not applicable | 1 |
0%
|
| Sysmiss | 1 |