| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know | 11 |
14.1%
|
| -8 | Refused | 1 |
1.3%
|
| -5 | Not applicable | 0 |
0%
|
| -3 | Missing | 34 |
43.6%
|
| 1 | Days | 8 |
10.3%
|
| 2 | Months | 10 |
12.8%
|
| 3 | Years | 14 |
17.9%
|
| Sysmiss | 16794 |