| Value | Category | Cases | |
|---|---|---|---|
| 1 | every month | 389 |
7.9%
|
| 2 | no months | 2971 |
60.6%
|
| 3 | number of months | 776 |
15.8%
|
| 8 | don't know | 762 |
15.5%
|
| 9 | refused | 7 |
0.1%
|