| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
17.5%
|
| 3 | 3 |
7.5%
|
|
| 4 | 6 |
15%
|
|
| 5 | 9 |
22.5%
|
|
| 6 | 4 |
10%
|
|
| 7 | 1 |
2.5%
|
|
| 9 | 1 |
2.5%
|
|
| 10 | 1 |
2.5%
|
|
| 20 | 2 |
5%
|
|
| 22 | 1 |
2.5%
|
|
| 23 | 1 |
2.5%
|
|
| 30 | 2 |
5%
|
|
| 40 | 1 |
2.5%
|
|
| 99 | 1 |
2.5%
|
|
| Sysmiss | 318 |