| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 5 |
0.8%
|
| 1 | Per day | 4 |
0.6%
|
| 2 | Per week | 96 |
15.3%
|
| 3 | Per month | 504 |
80.4%
|
| 4 | Per 3 months | 15 |
2.4%
|
| 5 | Per 6 months | 2 |
0.3%
|
| 6 | Per year | 1 |
0.2%
|
| Sysmiss | 2696 |