| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 19 |
10.9%
|
| -96 | Other | 6 |
3.4%
|
| 1 | Every month | 19 |
10.9%
|
| 2 | Every 3 months | 61 |
35.1%
|
| 3 | Every 6 months | 30 |
17.2%
|
| 4 | Every 12 months | 37 |
21.3%
|
| 5 | One time only | 2 |
1.1%
|
| Sysmiss | 12 |