| Value | Category | Cases | |
|---|---|---|---|
| 1 | Months | 48 |
7.1%
|
| 2 | Years | 605 |
89.6%
|
| 8 | DK | 0 |
0%
|
| 9 | Special | 22 |
3.3%
|
| Sysmiss | 17939 |