| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. never | 1967 |
74.8%
|
| 2 | 2. once | 233 |
8.9%
|
| 3 | 3. two or three times | 311 |
11.8%
|
| 4 | 4. often | 120 |
4.6%
|
| Sysmiss | 1907 |