| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 7 months | 14 |
13.2%
|
| 2 | 7 - 12 months | 14 |
13.2%
|
| 3 | More than12 month | 3 |
2.8%
|
| 4 | Don"t know | 75 |
70.8%
|
| 9 | Not stated | 0 |
0%
|
| Sysmiss | 399 |