| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. never | 60 |
1.3%
|
| 1 | 1. about once a year | 140 |
3.1%
|
| 2 | 2. about once a term | 3723 |
82.8%
|
| 3 | 3. about once a month | 315 |
7%
|
| 4 | 4. about once a week or more | 240 |
5.3%
|
| 77 | 77. d/r | 0 |
0%
|
| 99 | 99. missing | 20 |
0.4%
|
| Sysmiss | 40 |