| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.6%
|
| 1 | Annually | 3 |
7.7%
|
| 2 | Biannually/Every six months | 6 |
15.4%
|
| 3 | Quarterly | 2 |
5.1%
|
| 4 | Monthly | 20 |
51.3%
|
| 5 | Weekly | 4 |
10.3%
|
| 6 | Daily | 1 |
2.6%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 2 |
5.1%
|
| Sysmiss | 2030 |