| Value | Category | Cases | |
|---|---|---|---|
| 1 | every month | 253 |
5%
|
| 2 | no months | 2935 |
57.8%
|
| 3 | number of months | 1204 |
23.7%
|
| 8 | don't know | 666 |
13.1%
|
| 9 | refused | 21 |
0.4%
|