| Value | Category | Cases | |
|---|---|---|---|
| 1 | every month | 570 |
10.8%
|
| 2 | no months | 3592 |
68.3%
|
| 3 | number of months | 578 |
11%
|
| 8 | don't know | 512 |
9.7%
|
| 9 | refused | 8 |
0.2%
|