| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 60 |
1.3%
|
| 1 | 1. about once a year | 99 |
2.2%
|
| 2 | 2. about once a term | 3576 |
80.4%
|
| 3 | 3. about once a month | 553 |
12.4%
|
| 4 | 4. about once a week or more | 160 |
3.6%
|
| Sysmiss | 90 |