| Value | Category | Cases | |
|---|---|---|---|
| 0 | 18 |
75%
|
|
| 8 | 1 |
4.2%
|
|
| 15 | 1 |
4.2%
|
|
| 77 | Don't know | 4 |
16.7%
|
| Sysmiss | 5989 |