| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 197 |
4.4%
|
| 1 | 1. about once a year | 60 |
1.3%
|
| 2 | 2. about once a term | 1929 |
42.9%
|
| 3 | 3. about once a month | 989 |
22%
|
| 4 | 4. about once a week or more | 732 |
16.3%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 591 |
13.1%
|
| Sysmiss | 40 |