| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 month | 46 |
8.4%
|
| 2 | 1 to 3 months | 116 |
21.1%
|
| 3 | 3 to 6 months | 127 |
23.1%
|
| 4 | More than 6 months | 260 |
47.4%
|
| Sysmiss | 118 |