| Value | Category | 
                                    
                    
                        | 2 | None/Primary | 
                                    
                    
                        | 3 | Secondary/Vocational Education | 
                                    
                    
                        | 4 | Higher | 
                                    
                    
                        | 6 | Mother not in household | 
                                    
                    
                        | 9 | Missing/DK | 
                            
            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.