| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 660 |
11.9%
|
| 2 | 6 months to 12 months | 1190 |
21.5%
|
| 3 | More than 12 months | 3689 |
66.6%
|
| 11 | .D | 1 | |
| Sysmiss | 17073 |