| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 24 |
60%
|
| 2 | Biannually/Every six months | 4 |
10%
|
| 3 | Quarterly | 3 |
7.5%
|
| 4 | Monthly | 9 |
22.5%
|
| 5 | Weekly | 0 |
0%
|
| 6 | Daily | 0 |
0%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 320 |