| Value | Category | Cases | |
|---|---|---|---|
| -2 | don't know | 0 |
0%
|
| -1 | refuse | 0 |
0%
|
| 0 | 18 |
18.8%
|
|
| 5 | 9 |
9.4%
|
|
| 7 | 1 |
1%
|
|
| 8 | 1 |
1%
|
|
| 10 | 8 |
8.3%
|
|
| 15 | 16 |
16.7%
|
|
| 20 | 17 |
17.7%
|
|
| 25 | 3 |
3.1%
|
|
| 30 | 15 |
15.6%
|
|
| 37 | 1 |
1%
|
|
| 40 | 7 |
7.3%
|
|
| Sysmiss | 953 |