| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3006 |
95.4%
|
| 1 | Once | 70 |
2.2%
|
| 2 | More than once | 36 |
1.1%
|
| 3 | Not applicable | 37 |
1.2%
|
| Sysmiss | 1 |