| Value | Category | Cases | |
|---|---|---|---|
| -9 | do not know | 3 |
30%
|
| 2 | 2 |
20%
|
|
| 3 | 1 |
10%
|
|
| 5 | 1 |
10%
|
|
| 12 | 1 |
10%
|
|
| 20 | 1 |
10%
|
|
| 23 | 1 |
10%
|
|
| Sysmiss | 138 |