| Value | Category | 
                                    
                    
                        | -9 | break-off | 
                                    
                    
                        | -7 | Legal skip | 
                                    
                    
                        | -3 | interviewer error | 
                                    
                    
                        | 1 | Very well | 
                                    
                    
                        | 2 | Quite well | 
                                    
                    
                        | 3 | Not so well | 
                                    
                    
                        | 4 | Poorly | 
                                    
                    
                        | 5 | A lot of difficulty understanding | 
                                    
                    
                        | Sysmiss |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.