| Value | Category | 
                                    
                    
                        | 0 | Preschool/kindergarten | 
                                    
                    
                        | 1 | Primary | 
                                    
                    
                        | 2 | preparatory | 
                                    
                    
                        | 3 | Secondary | 
                                    
                    
                        | 4 | academy | 
                                    
                    
                        | 5 | univercityand high | 
                                    
                    
                        | 8 | DK | 
                                    
                    
                        | 9 | Missing | 
                            
            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.