| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 45 |
7.5%
|
| 0 | 295 |
49.4%
|
|
| 1 | 140 |
23.5%
|
|
| 2 | 58 |
9.7%
|
|
| 3 | 41 |
6.9%
|
|
| 4 | 1 |
0.2%
|
|
| 5 | 16 |
2.7%
|
|
| 8 | 1 |
0.2%
|
|
| Sysmiss | 703 |