| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
5.2%
|
| 0 | 2 |
2.1%
|
|
| 1 | 35 |
36.5%
|
|
| 2 | 10 |
10.4%
|
|
| 3 | 4 |
4.2%
|
|
| 4 | 2 |
2.1%
|
|
| 5 | 12 |
12.5%
|
|
| 7 | 1 |
1%
|
|
| 10 | 9 |
9.4%
|
|
| 15 | 1 |
1%
|
|
| 20 | 6 |
6.3%
|
|
| 25 | 2 |
2.1%
|
|
| 30 | 4 |
4.2%
|
|
| 40 | 3 |
3.1%
|
|
| Sysmiss | 272 |