| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 3555 |
81.8%
|
| 1 | 1. about once a year | 140 |
3.2%
|
| 2 | 2. about once a term | 155 |
3.6%
|
| 3 | 3. about once a month | 318 |
7.3%
|
| 4 | 4. about once a week or more | 180 |
4.1%
|
| Sysmiss | 190 |