| Value | Category | Cases | |
|---|---|---|---|
| 1 | once a week | 127 |
47.6%
|
| 2 | every two weeks | 34 |
12.7%
|
| 3 | once a month | 103 |
38.6%
|
| 4 | every three months | 2 |
0.7%
|
| 5 | every six months | 0 |
0%
|
| 6 | once a year | 1 |
0.4%
|
| 7 | less than once a year | 0 |
0%
|
| Sysmiss | 943 |