| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 1 | 1 |
10%
|
|
| 7 | 1 |
10%
|
|
| 10 | 1 |
10%
|
|
| 14 | 3 |
30%
|
|
| 20 | 1 |
10%
|
|
| 30 | 3 |
30%
|
|
| Sysmiss | 969 |