| Value | Category | 
                                    
                    
                        | 1 | Elementary school | 
                                    
                    
                        | 2 | Vocational school -1- year | 
                                    
                    
                        | 3 | Vocational school -2- years | 
                                    
                    
                        | 4 | Secondary - 3 years and school for skilled workers | 
                                    
                    
                        | 5 | Secondary - 4 years and school for highly skilled workers | 
                                    
                    
                        | 6 | Secondary art school (music, ballet) -4 years | 
                                    
                    
                        | 7 | Special school for mentally handicapped children | 
                                    
                    
                        | 8 | Gymnasium | 
                                    
                    
                        | 9 | Specialist education after secondary school-1 year | 
                                    
                    
                        | 10 | Doesn t attend school | 
                                    
                    
                        | 9999998 | REFUSAL | 
                                    
                    
                        | 9999999 | DONTKNOW | 
                                    
                    
                        | 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.