| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | Annually | 8 |
3.4%
|
| 2 | Biannually/Every six months | 7 |
3%
|
| 3 | Quarterly | 25 |
10.7%
|
| 4 | Monthly | 185 |
79.4%
|
| 5 | Weekly | 4 |
1.7%
|
| 6 | Daily | 3 |
1.3%
|
| 7 | Hourly | 1 |
0.4%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 171 |