| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 18 |
3.7%
|
| 1 | Annually | 65 |
13.3%
|
| 2 | Biannually/Every six months | 75 |
15.3%
|
| 3 | Quarterly | 132 |
27%
|
| 4 | Monthly | 187 |
38.2%
|
| 5 | Weekly | 6 |
1.2%
|
| 6 | Daily | 4 |
0.8%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 2 |
0.4%
|
| Sysmiss | 880 |