| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 1 |
25%
|
| -8 | Refused | 0 |
0%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 1 |
25%
|
| 1 | Days | 0 |
0%
|
| 2 | Months | 1 |
25%
|
| 3 | Years | 1 |
25%
|
| Sysmiss | 16868 |