| Value | Category | Cases | |
|---|---|---|---|
| 1 | a. Once per month or more often | 256 |
61.7%
|
| 2 | b. Once per every two months | 157 |
37.8%
|
| 3 | c. Once per every six months or year | 2 |
0.5%
|
| Sysmiss | 262 |