| Value | Category | Cases | |
|---|---|---|---|
| -98 | Don't know | 4 |
0.2%
|
| 1 | Less than 6 months | 53 |
2.4%
|
| 2 | 6 months | 1454 |
66%
|
| 3 | More than 6 months | 692 |
31.4%
|
| Sysmiss | 68 |