| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.5%
|
| 1 | Annually | 21 |
11.5%
|
| 2 | Biannually/Every six months | 12 |
6.6%
|
| 3 | Quarterly | 52 |
28.6%
|
| 4 | Monthly | 75 |
41.2%
|
| 5 | Weekly | 7 |
3.8%
|
| 6 | Daily | 14 |
7.7%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 60 |