| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | To complete a full | 
                                    
                    
                        | 2 | Received, but partially | 
                                    
                    
                        | 3 | Received no | 
                                    
                    
                        | 4 | Works less than 3 months | 
                                    
                    
                        | 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.