| Value | Category | Cases | |
|---|---|---|---|
| 1 | 18-21 | 4 |
4%
|
| 2 | 22-35 | 44 |
44%
|
| 3 | 36-59 | 46 |
46%
|
| 4 | over60 | 6 |
6%
|
| Missing value | 168 |