| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
1.9%
|
| 1 | Annually | 6 |
1.3%
|
| 2 | Biannually/Every six months | 34 |
7.2%
|
| 3 | Quarterly | 73 |
15.5%
|
| 4 | Monthly | 337 |
71.5%
|
| 5 | Weekly | 6 |
1.3%
|
| 6 | Daily | 6 |
1.3%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 852 |