| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
1.5%
|
| 0 | 164 |
82%
|
|
| 10 | 5 |
2.5%
|
|
| 20 | 9 |
4.5%
|
|
| 30 | 2 |
1%
|
|
| 40 | 1 |
0.5%
|
|
| 50 | 3 |
1.5%
|
|
| 60 | 2 |
1%
|
|
| 65 | 2 |
1%
|
|
| 80 | 3 |
1.5%
|
|
| 100 | 6 |
3%
|
|
| Sysmiss | 401 |