| Value | Category | 
                                    
                    
                        | 0 | none | 
                                    
                    
                        | 1 | Nursery/Kindergarten | 
                                    
                    
                        | 2 | Primary | 
                                    
                    
                        | 3 | Post-Primary/Vocational | 
                                    
                    
                        | 4 | Secondary/ 'A' level | 
                                    
                    
                        | 5 | College (Middle level) | 
                                    
                    
                        | 6 | University | 
                            
            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.