| Value | Category | 
                                    
                    
                        | got disabled |  | 
                                    
                    
                        | old age |  | 
                                    
                    
                        | processing work transfer |  | 
                                    
                    
                        | refuse to work |  | 
                                    
                    
                        | very old |  | 
                                    
                    
                        | wait to join studies |  | 
                            
            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.