| Value | Category | 
                                    
                    
                        | 1 | worsened very much | 
                                    
                    
                        | 2 | slightly worsened | 
                                    
                    
                        | 3 | is the same (has not changed) | 
                                    
                    
                        | 4 | slightly improved | 
                                    
                    
                        | 5 | improved very much | 
                                    
                    
                        | 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.