| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.8%
|
| 1 | Annually | 36 |
29%
|
| 2 | Biannually/Every six months | 15 |
12.1%
|
| 3 | Quarterly | 20 |
16.1%
|
| 4 | Monthly | 52 |
41.9%
|
| 5 | Weekly | 0 |
0%
|
| 6 | Daily | 0 |
0%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 147 |