| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
3.3%
|
| 0 | None | 44 |
36.1%
|
| 1 | 12 |
9.8%
|
|
| 2 | 8 |
6.6%
|
|
| 3 | 2 |
1.6%
|
|
| 5 | 15 |
12.3%
|
|
| 7 | 2 |
1.6%
|
|
| 8 | 3 |
2.5%
|
|
| 10 | 15 |
12.3%
|
|
| 15 | 5 |
4.1%
|
|
| 20 | 3 |
2.5%
|
|
| 23 | 1 |
0.8%
|
|
| 30 | 7 |
5.7%
|
|
| 40 | 1 |
0.8%
|
|
| Sysmiss | 26 |