| Value | Category | Cases | |
|---|---|---|---|
| 1 | < 2 years | 2859 |
37.6%
|
| 2 | 2 years | 2520 |
33.1%
|
| 3 | 3 years | 1106 |
14.5%
|
| 4 | 4+ years | 1124 |
14.8%
|
| Sysmiss | 2347 |