| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. every month | 774 |
85.8%
|
| 2 | 2. every 2 months | 112 |
12.4%
|
| 3 | 3. every 3 months | 10 |
1.1%
|
| 4 | 4. i dont know | 6 |
0.7%
|
| 5 | 5. other | 0 |
0%
|
| Sysmiss | 661 |