| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than one month | 9 |
4.5%
|
| 2 | More than one month and less than 3 months | 17 |
8.5%
|
| 3 | 3 months to less than 6 months | 36 |
18.1%
|
| 4 | 6 months to 12 months | 49 |
24.6%
|
| 5 | More than one year | 59 |
29.6%
|
| 98 | Don’t know | 29 |
14.6%
|
| Sysmiss | 1 |