| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 39 |
9.8%
|
| 2 | Between 6 months and 1 year | 44 |
11.1%
|
| 3 | Between 1 and 3 years | 49 |
12.3%
|
| 4 | More than 3 years | 266 |
66.8%
|
| Sysmiss | 2142 |