| Value | Category | Cases | |
|---|---|---|---|
| 0 | 4 |
26.7%
|
|
| 10 | 2 |
13.3%
|
|
| 15 | 1 |
6.7%
|
|
| 30 | 6 |
40%
|
|
| 40 | 1 |
6.7%
|
|
| 55 | 1 |
6.7%
|
|
| Sysmiss | don't know | 0 | |
| Sysmiss | refusal | 0 |