| Value | Category | Cases | |
|---|---|---|---|
| -2 | don't know | 1 |
3.2%
|
| -1 | refuse | 0 |
0%
|
| 0 | 3 |
9.7%
|
|
| 20 | 1 |
3.2%
|
|
| 30 | 26 |
83.9%
|
|
| Sysmiss | 1018 |