| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. every month | 841 |
92.8%
|
| 2 | 2. every 2 months | 53 |
5.8%
|
| 3 | 3. every 3 months | 12 |
1.3%
|
| 4 | 4. i dont know | 0 |
0%
|
| 5 | 5. other | 0 |
0%
|
| Sysmiss | 657 |