| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| 1 | Annually | 48 |
11.6%
|
| 2 | Biannually/Every six months | 32 |
7.7%
|
| 3 | Quarterly | 26 |
6.3%
|
| 4 | Monthly | 249 |
60%
|
| 5 | Weekly | 20 |
4.8%
|
| 6 | Daily | 29 |
7%
|
| 7 | Hourly | 6 |
1.4%
|
| 8 | More than once in an hour | 4 |
1%
|
| Sysmiss | 1654 |