| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.9%
|
| -7 | Does not apply (spontaneous) | 159 |
76.8%
|
| 0 | 31 |
15%
|
|
| 30 | 2 |
1%
|
|
| 70 | 1 |
0.5%
|
|
| 96 | 1 |
0.5%
|
|
| 100 | 9 |
4.3%
|
|
| Sysmiss | 154 |