| Value | Category | Cases | |
|---|---|---|---|
| 0 | never | 997 |
49.8%
|
| 1 | only once | 196 |
9.8%
|
| 2 | sometimes | 500 |
25%
|
| 3 | often | 308 |
15.4%
|
| Sysmiss | 3 |