| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing data | 13 | 
                                    
                                    0.1%
                                 | 
| 0 | Not at all well | 3723 | 
                                    
                                    14.7%
                                 | 
| 1 | Not very well | 6825 | 
                                    
                                    26.9%
                                 | 
| 2 | Well | 7545 | 
                                    
                                    29.7%
                                 | 
| 3 | Very well | 4094 | 
                                    
                                    16.1%
                                 | 
| 9 | Don't know | 3197 | 
                                    
                                    12.6%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |