| Value | Category | Cases | |
|---|---|---|---|
| 3 | 1 |
1.7%
|
|
| 4 | 1 |
1.7%
|
|
| 15 | 1 |
1.7%
|
|
| 20 | 5 |
8.3%
|
|
| 30 | 16 |
26.7%
|
|
| 34 | 1 |
1.7%
|
|
| 40 | 1 |
1.7%
|
|
| 45 | 1 |
1.7%
|
|
| 77 | Don't know | 33 |
55%
|
| Sysmiss | 2047 |