| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 30 |
13.8%
|
| -8 | Refused | 1 |
0.5%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 70 |
32.3%
|
| 1 | Days | 25 |
11.5%
|
| 2 | Months | 28 |
12.9%
|
| 3 | Years | 63 |
29%
|
| Sysmiss | 16655 |