| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 86 |
7.6%
|
| 2 | 6 months | 738 |
65.4%
|
| 3 | More than 6 months | 276 |
24.5%
|
| 8 | Do not know | 28 |
2.5%
|