| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 32 |
11.2%
|
| -8 | Refused | 1 |
0.4%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 94 |
33%
|
| 1 | Days | 30 |
10.5%
|
| 2 | Months | 40 |
14%
|
| 3 | Years | 88 |
30.9%
|
| Sysmiss | 16587 |