| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 15 |
5.5%
|
| 2 | Biannually/Every six months | 80 |
29.5%
|
| 3 | Quarterly | 49 |
18.1%
|
| 4 | Monthly | 122 |
45%
|
| 5 | Weekly | 2 |
0.7%
|
| 6 | Daily | 1 |
0.4%
|
| 7 | Hourly | 2 |
0.7%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 330 |