| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.4%
|
| 1 | Annually | 10 |
3.9%
|
| 2 | Biannually/Every six months | 6 |
2.3%
|
| 3 | Quarterly | 15 |
5.8%
|
| 4 | Monthly | 213 |
82.9%
|
| 5 | Weekly | 5 |
1.9%
|
| 6 | Daily | 7 |
2.7%
|
| 7 | Hourly | 0 |
0%
|
| 8 | More than once in an hour | 0 |
0%
|
| Sysmiss | 324 |