| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 5 |
18.5%
|
| 2 | Biannually/Every six months | 5 |
18.5%
|
| 3 | Quarterly | 5 |
18.5%
|
| 4 | Monthly | 8 |
29.6%
|
| 5 | Weekly | 1 |
3.7%
|
| 6 | Daily | 3 |
11.1%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 1173 |