| Value | Category | 
                                    
                    
                        | 0 | None | 
                                    
                    
                        | 1 | 8 Years school | 
                                    
                    
                        | 2 | Secondary general | 
                                    
                    
                        | 3 | Vocational 2 years | 
                                    
                    
                        | 4 | Vocational 4/5 years | 
                                    
                    
                        | 5 | University | 
                                    
                    
                        | 6 | Post-University | 
                                    
                    
                        | 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.