| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 2 |
7.1%
|
| -8 | Refused | 0 |
0%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 12 |
42.9%
|
| 1 | Days | 5 |
17.9%
|
| 2 | Months | 4 |
14.3%
|
| 3 | Years | 5 |
17.9%
|
| Sysmiss | 16844 |