| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 19 |
13%
|
| -8 | Refused | 1 |
0.7%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 51 |
34.9%
|
| 1 | Days | 16 |
11%
|
| 2 | Months | 10 |
6.8%
|
| 3 | Years | 49 |
33.6%
|
| Sysmiss | 16726 |