| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 2287 |
9.3%
|
| 2 | Monthly | 2070 |
8.4%
|
| 3 | Yearly | 1599 |
6.5%
|
| 4 | Not all | 18670 |
75.8%
|
| Sysmiss | 534 |