| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 31 |
3.8%
|
| 2 | 6 - 12 months | 22 |
2.7%
|
| 3 | More than one year but less than 2 | 29 |
3.6%
|
| 4 | 2 years or more | 73 |
9.1%
|
| 5 | Uncertain | 650 |
80.6%
|
| r | 1 |
0.1%
|
|
| Sysmiss | 119 |