| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 5 |
14.3%
|
| -96 | Other | 1 |
2.9%
|
| 1 | Every month | 6 |
17.1%
|
| 2 | Every 3 months | 2 |
5.7%
|
| 3 | Every 6 months | 4 |
11.4%
|
| 4 | Every 12 months | 6 |
17.1%
|
| 5 | One time only | 11 |
31.4%
|
| Sysmiss | 151 |