| Value | Category | Cases | |
|---|---|---|---|
| 1 | daily | 3 |
0.1%
|
| 2 | once a week | 2 |
0.1%
|
| 3 | once a month | 167 |
4.9%
|
| 4 | never | 6 |
0.2%
|
| 6 | other | 280 |
8.2%
|
| 8 | dtk | 13 |
0.4%
|
| 9 | na | 2934 |
86.2%
|
| Sysmiss | 693 |