| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 4 |
5.3%
|
| 2 | Biannually/Every six months | 7 |
9.3%
|
| 3 | Quarterly | 16 |
21.3%
|
| 4 | Monthly | 41 |
54.7%
|
| 5 | Weekly | 4 |
5.3%
|
| 6 | Daily | 3 |
4%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 286 |