| Value | Category | Cases | |
|---|---|---|---|
| 1 | a. Once per month or more often | 4552 |
19.7%
|
| 2 | b. Once per every two months | 5458 |
23.6%
|
| 3 | c. Once per every six months or year | 880 |
3.8%
|
| Missing value | 12248 |
52.9%
|