| Value | Category | Cases | |
|---|---|---|---|
| 1 | months | 76 |
1.2%
|
| 2 | years | 405 |
6.2%
|
| 9 | not applicable | 5589 |
85.7%
|
| 9999995 | missing:impute | 454 |
7%
|
| Sysmiss | 79 |