| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
8.5%
|
| 1 | Annually | 33 |
40.2%
|
| 2 | Biannually/Every six months | 9 |
11%
|
| 3 | Quarterly | 16 |
19.5%
|
| 4 | Monthly | 9 |
11%
|
| 5 | Weekly | 4 |
4.9%
|
| 6 | Daily | 4 |
4.9%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 1287 |