| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
1.5%
|
| 1 | Annually | 16 |
2%
|
| 2 | Biannually/Every six months | 63 |
8.1%
|
| 3 | Quarterly | 134 |
17.2%
|
| 4 | Monthly | 524 |
67.1%
|
| 5 | Weekly | 23 |
2.9%
|
| 6 | Daily | 9 |
1.2%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 542 |