| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.8%
|
| 1 | Annually | 43 |
19.5%
|
| 2 | Biannually/Every six months | 12 |
5.4%
|
| 3 | Quarterly | 23 |
10.4%
|
| 4 | Monthly | 126 |
57%
|
| 5 | Weekly | 8 |
3.6%
|
| 6 | Daily | 5 |
2.3%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 141 |