| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 2274 |
50.6%
|
| 1 | 1. about once a year | 195 |
4.3%
|
| 2 | 2. about once a term | 619 |
13.8%
|
| 3 | 3. about once a month | 538 |
12%
|
| 4 | 4. about once a week or more | 573 |
12.7%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 299 |
6.6%
|
| Sysmiss | 40 |