| Value | Category | 
                                    
                    
                        | 0 | No education | 
                                    
                    
                        | 1 | < primary complete | 
                                    
                    
                        | 2 | < secondary complete | 
                                    
                    
                        | 3 | Secondary complete + | 
                            
            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.