| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing data | 11 | 
                                    
                                    0%
                                 | 
| 0 | Not at all well | 3145 | 
                                    
                                    12.4%
                                 | 
| 1 | Not very well | 7430 | 
                                    
                                    29.3%
                                 | 
| 2 | Well | 8356 | 
                                    
                                    32.9%
                                 | 
| 3 | Very well | 3288 | 
                                    
                                    12.9%
                                 | 
| 9 | Don't know | 3167 | 
                                    
                                    12.5%
                                 | 
| 998 | Refused | 0 | 
                                    
                                    0%
                                 |