| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 month | 43 |
11.4%
|
| 2 | 1 to 3 months | 80 |
21.3%
|
| 3 | 3 to 6 months | 75 |
19.9%
|
| 4 | More than 6 months | 178 |
47.3%
|
| Sysmiss | 70 |