| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months | 7 |
11.3%
|
| 2 | Between 12 to 24 months | 3 |
4.8%
|
| 3 | More than 20 months | 6 |
9.7%
|
| 4 | No Limited | 46 |
74.2%
|
| Sysmiss | 2858 |