| Value | Category | Cases | |
|---|---|---|---|
| -4 | 50 | 
                                    
                                    6.7%
                                 | |
| 0 | 288 | 
                                    
                                    38.8%
                                 | |
| 1 | 81 | 
                                    
                                    10.9%
                                 | |
| 2 | 324 | 
                                    
                                    43.6%
                                 |