| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 2 |
2.7%
|
| 2 | Biannually/Every six months | 1 |
1.4%
|
| 3 | Quarterly | 6 |
8.1%
|
| 4 | Monthly | 59 |
79.7%
|
| 5 | Weekly | 3 |
4.1%
|
| 6 | Daily | 3 |
4.1%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 507 |