| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
25%
|
| 0 | 33 |
55%
|
|
| 1 | 1 |
1.7%
|
|
| 15 | 1 |
1.7%
|
|
| 20 | 3 |
5%
|
|
| 25 | 1 |
1.7%
|
|
| 30 | 4 |
6.7%
|
|
| 40 | 1 |
1.7%
|
|
| 45 | 1 |
1.7%
|
|
| Sysmiss | 91 |