| Value | Category | Cases | |
|---|---|---|---|
| 1 | annual | 26 |
46.4%
|
| 2 | monthly | 24 |
42.9%
|
| 3 | weekly | 1 |
1.8%
|
| 4 | daily | 1 |
1.8%
|
| 5 | don't know | 4 |
7.1%
|
| Sysmiss | 1744 |