| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1-6 months | 50 |
23.4%
|
| 2 | 6-12 months | 80 |
37.4%
|
| 3 | 1-2 years | 37 |
17.3%
|
| 4 | more than 2 years | 47 |
22%
|
| Sysmiss | 7811 |