| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 1243 |
5.2%
|
| 2 | Monthly | 972 |
4.1%
|
| 3 | Yearly | 1606 |
6.8%
|
| 4 | Not all | 19933 |
83.9%
|
| Sysmiss | 1058 |