| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 14 |
21.2%
|
| -96 | Other | 8 |
12.1%
|
| 1 | Every month | 5 |
7.6%
|
| 2 | Every 3 months | 2 |
3%
|
| 3 | Every 6 months | 7 |
10.6%
|
| 4 | Every 12 months | 14 |
21.2%
|
| 5 | One time only | 16 |
24.2%
|
| Sysmiss | 120 |