| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
3.8%
|
| 1 | Annually | 22 |
41.5%
|
| 2 | Biannually/Every six months | 12 |
22.6%
|
| 3 | Quarterly | 6 |
11.3%
|
| 4 | Monthly | 8 |
15.1%
|
| 5 | Weekly | 3 |
5.7%
|
| 6 | Daily | 0 |
0%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 1043 |