| Value | Category | Cases | |
|---|---|---|---|
| 1 | a. Once per month or more often | 1777 |
57.3%
|
| 2 | b. Once per every two months | 1194 |
38.5%
|
| 3 | c. Once per every six months or year | 130 |
4.2%
|
| Sysmiss | 1867 |