| Value | Category | Cases | |
|---|---|---|---|
| 1 | a. Once per month or more often | 4309 |
18%
|
| 2 | b. Once per every two months | 6159 |
25.7%
|
| 3 | c. Once per every six months or year | 972 |
4.1%
|
| Missing value | 12514 |
52.2%
|