| Value | Category | 
                                    
                    
                        | 1 | bacherlor | 
                                    
                    
                        | 2 | doctoral | 
                                    
                    
                        | 3 | high | 
                                    
                    
                        | 4 | master | 
                                    
                    
                        | 5 | no_edu | 
                                    
                    
                        | 6 | pre | 
                                    
                    
                        | 7 | primary | 
                                    
                    
                        | 8 | secondary | 
                                    
                    
                        | 9 | vocational | 
                                    
                    
                        | Missing value |  | 
                            
            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.