| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 23 |
18.4%
|
| -96 | Other | 6 |
4.8%
|
| 1 | Every month | 31 |
24.8%
|
| 2 | Every 3 months | 16 |
12.8%
|
| 3 | Every 6 months | 12 |
9.6%
|
| 4 | Every 12 months | 31 |
24.8%
|
| 5 | One time only | 6 |
4.8%
|
| Sysmiss | 61 |