| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
9.1%
|
| 1 | Annually | 0 |
0%
|
| 2 | Biannually/Every six months | 2 |
18.2%
|
| 3 | Quarterly | 1 |
9.1%
|
| 4 | Monthly | 2 |
18.2%
|
| 5 | Weekly | 1 |
9.1%
|
| 6 | Daily | 4 |
36.4%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 229 |