| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 25 |
35.2%
|
| 2 | One year | 16 |
22.5%
|
| 3 | 1-2 years | 30 |
42.3%
|
| 4 | More than 2 years | 0 |
0%
|
| Sysmiss | 812 |