| Value | Category | Cases | |
|---|---|---|---|
| 1 | every month | 166 |
3.2%
|
| 2 | no months | 2782 |
52.9%
|
| 3 | number of months | 1633 |
31%
|
| 8 | don't know | 670 |
12.7%
|
| 9 | refused | 9 |
0.2%
|