| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.9%
|
| 1 | Annually | 83 |
32%
|
| 2 | Biannually/Every six months | 40 |
15.4%
|
| 3 | Quarterly | 46 |
17.8%
|
| 4 | Monthly | 75 |
29%
|
| 5 | Weekly | 4 |
1.5%
|
| 6 | Daily | 5 |
1.9%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 1 |
0.4%
|
| Sysmiss | 513 |