| Value | Category | Cases | |
|---|---|---|---|
| -9 | do not know | 0 |
0%
|
| 0 | 40 |
88.9%
|
|
| 20 | 2 |
4.4%
|
|
| 30 | 2 |
4.4%
|
|
| 80 | 1 |
2.2%
|
|
| Sysmiss | 103 |