| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every week | 17 |
2.6%
|
| 2 | Every two weeks | 14 |
2.1%
|
| 3 | Every month | 343 |
52.4%
|
| 4 | Every three months | 113 |
17.3%
|
| 5 | Every six months | 18 |
2.7%
|
| 6 | Every year | 13 |
2%
|
| 7 | One off | 137 |
20.9%
|
| 9 | Refusal | 0 |
0%
|
| Sysmiss | 1249 |