| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 818 |
35.1%
|
| 1 | Once | 540 |
23.2%
|
| 2 | Twice | 422 |
18.1%
|
| 3 | Three times | 230 |
9.9%
|
| 4 | More than three times | 322 |
13.8%
|
| Sysmiss | 2890 |