| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
1.9%
|
| 0 | 8 |
2.5%
|
|
| 1 | 133 |
41.4%
|
|
| 2 | 68 |
21.2%
|
|
| 3 | 40 |
12.5%
|
|
| 4 | 15 |
4.7%
|
|
| 5 | 18 |
5.6%
|
|
| 6 | 7 |
2.2%
|
|
| 7 | 3 |
0.9%
|
|
| 8 | 2 |
0.6%
|
|
| 10 | 12 |
3.7%
|
|
| 12 | 1 |
0.3%
|
|
| 15 | 2 |
0.6%
|
|
| 18 | 1 |
0.3%
|
|
| 20 | 2 |
0.6%
|
|
| 28 | 1 |
0.3%
|
|
| 30 | 2 |
0.6%
|
|
| Sysmiss | 598 |