| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 3248 |
72.2%
|
| 1 | 1. about once a year | 114 |
2.5%
|
| 2 | 2. about once a term | 235 |
5.2%
|
| 3 | 3. about once a month | 358 |
8%
|
| 4 | 4. about once a week or more | 255 |
5.7%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 288 |
6.4%
|
| Sysmiss | 40 |