| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 3 |
1.8%
|
| 2 | Biannually/Every six months | 9 |
5.5%
|
| 3 | Quarterly | 5 |
3%
|
| 4 | Monthly | 118 |
71.5%
|
| 5 | Weekly | 10 |
6.1%
|
| 6 | Daily | 15 |
9.1%
|
| 7 | Hourly | 3 |
1.8%
|
| 8 | More than once in an hour | 2 |
1.2%
|
| Sysmiss | 1904 |