| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 22 |
3.5%
|
| 2 | Biannually/Every six months | 16 |
2.5%
|
| 3 | Quarterly | 61 |
9.6%
|
| 4 | Monthly | 508 |
80%
|
| 5 | Weekly | 19 |
3%
|
| 6 | Daily | 9 |
1.4%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 702 |