| Value | Category | 
                                    
                    
                        | 0 | Should not continue to work | 
                                    
                    
                        | 1 | Can continue to work | 
                                    
                    
                        | 8 | Don't know, not sure, depends | 
                                    
                    
                        | 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.