| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 15 |
48.4%
|
| 2 | Biannually/Every six months | 6 |
19.4%
|
| 3 | Quarterly | 4 |
12.9%
|
| 4 | Monthly | 3 |
9.7%
|
| 5 | Weekly | 2 |
6.5%
|
| 6 | Daily | 1 |
3.2%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 741 |