| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 42 |
53.2%
|
| 0 | 15 |
19%
|
|
| 1 | 10 |
12.7%
|
|
| 2 | 2 |
2.5%
|
|
| 5 | 5 |
6.3%
|
|
| 10 | 2 |
2.5%
|
|
| 30 | 1 |
1.3%
|
|
| 40 | 1 |
1.3%
|
|
| 70 | 1 |
1.3%
|
|
| Sysmiss | 423 |