| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 14 |
5.2%
|
| 2 | Biannually/Every six months | 11 |
4.1%
|
| 3 | Quarterly | 23 |
8.5%
|
| 4 | Monthly | 205 |
75.9%
|
| 5 | Weekly | 4 |
1.5%
|
| 6 | Daily | 13 |
4.8%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 90 |