| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 years | 26 |
9.9%
|
| 2 | 1-2 years | 3 |
1.1%
|
| 3 | 3-9 years | 222 |
84.7%
|
| 4 | 10-12 years | 11 |
4.2%
|
| Sysmiss | 20 |