| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 24 |
8.4%
|
| 0 | 2 |
0.7%
|
|
| 10 | 1 |
0.4%
|
|
| 40 | 1 |
0.4%
|
|
| 60 | 1 |
0.4%
|
|
| 99 | 1 |
0.4%
|
|
| 100 | 255 |
89.5%
|
|
| Sysmiss | 485 |