| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.1%
|
| 1 | Annually | 53 |
6.5%
|
| 2 | Biannually/Every six months | 17 |
2.1%
|
| 3 | Quarterly | 21 |
2.6%
|
| 4 | Monthly | 709 |
86.7%
|
| 5 | Weekly | 11 |
1.3%
|
| 6 | Daily | 5 |
0.6%
|
| 7 | Hourly | 1 |
0.1%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 845 |