| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 139 |
3.2%
|
| 1 | 1. about once a year | 59 |
1.3%
|
| 2 | 2. about once a term | 2213 |
50.4%
|
| 3 | 3. about once a month | 1081 |
24.6%
|
| 4 | 4. about once a week or more | 899 |
20.5%
|
| Sysmiss | 147 |