| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 8 |
0.3%
|
| 2 | Monthly | 391 |
12.7%
|
| 3 | Every three months | 1612 |
52.2%
|
| 4 | Every six months | 398 |
12.9%
|
| 5 | Once a year | 367 |
11.9%
|
| 6 | Never | 311 |
10.1%
|
| Sysmiss | 11 |