| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 424 |
10.9%
|
| 2 | 6 months | 2483 |
63.6%
|
| 3 | More than 6 months | 909 |
23.3%
|
| 8 | Do not know | 91 |
2.3%
|