| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 20 |
3.9%
|
| 2 | Between 1 and 4 | 147 |
28.6%
|
| 3 | Between5 and 9 years | 116 |
22.6%
|
| 4 | 10 years + | 231 |
44.9%
|
| Sysmiss | 77 |