| Value | Category | 
                                    
                    
                        | 0 | No education, preschool/early childhood education | 
                                    
                    
                        | 1 | Elementary (1-6) | 
                                    
                    
                        | 2 | Junior High (7-9) | 
                                    
                    
                        | 3 | Senior High (10-12) | 
                                    
                    
                        | 4 | Higher | 
                            
            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.