| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 1 |
6.7%
|
|
| 5 | 1 |
6.7%
|
|
| 20 | 4 |
26.7%
|
|
| 50 | 7 |
46.7%
|
|
| 60 | 2 |
13.3%
|
|
| Sysmiss | 135 |