| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.4%
|
| 1 | Annually | 17 |
7.4%
|
| 2 | Biannually/Every six months | 6 |
2.6%
|
| 3 | Quarterly | 18 |
7.9%
|
| 4 | Monthly | 139 |
60.7%
|
| 5 | Weekly | 19 |
8.3%
|
| 6 | Daily | 25 |
10.9%
|
| 7 | Hourly | 3 |
1.3%
|
| 8 | More than once in an hour | 1 |
0.4%
|
| Sysmiss | 303 |