| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 4 |
9.3%
|
| 2 | Biannually/Every six months | 3 |
7%
|
| 3 | Quarterly | 3 |
7%
|
| 4 | Monthly | 18 |
41.9%
|
| 5 | Weekly | 3 |
7%
|
| 6 | Daily | 11 |
25.6%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 1 |
2.3%
|
| Sysmiss | 489 |