| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once a month | 2 |
50%
|
| 2 | Once every two months | 0 |
0%
|
| 3 | Once every three months | 2 |
50%
|
| 4 | Once every four months | 0 |
0%
|
| 5 | Once every six months | 0 |
0%
|
| 6 | Once a year | 0 |
0%
|
| 95 | Other (please specify) | 0 |
0%
|
| 98 | Unknown | 0 |
0%
|
| Sysmiss | 937 |