| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 24 | 
                                    
                                    2.4%
                                 | 
| 1 | Lower | 683 | 
                                    
                                    68%
                                 | 
| 2 | Middle | 127 | 
                                    
                                    12.6%
                                 | 
| 3 | Higher | 170 | 
                                    
                                    16.9%
                                 |