| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
5.6%
|
| 1 | Annually | 29 |
20.3%
|
| 2 | Biannually/Every six months | 13 |
9.1%
|
| 3 | Quarterly | 38 |
26.6%
|
| 4 | Monthly | 46 |
32.2%
|
| 5 | Weekly | 2 |
1.4%
|
| 6 | Daily | 7 |
4.9%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 1194 |