| Value | Category | 
                                    
                    
                        | 00 | NIU (not in universe) | 
                                    
                    
                        | 10 | Illiterate or semi-literate | 
                                    
                    
                        | 21 | Primary school, attending | 
                                    
                    
                        | 22 | Primary school, completed | 
                                    
                    
                        | 23 | Primary school, did not graduate | 
                                    
                    
                        | 24 | Primary school, other | 
                                    
                    
                        | 31 | Junior middle school, attending | 
                                    
                    
                        | 32 | Junior middle school, completed | 
                                    
                    
                        | 33 | Junior middle school, did not graduate | 
                                    
                    
                        | 34 | Junior middle school, other | 
                                    
                    
                        | 41 | Academic secondary school, attending | 
                                    
                    
                        | 42 | Academic secondary school, completed | 
                                    
                    
                        | 43 | Academic secondary school, did not graduate | 
                                    
                    
                        | 44 | Academic secondary school, other | 
                                    
                    
                        | 51 | Technical secondary school, attending | 
                                    
                    
                        | 52 | Technical secondary school, completed | 
                                    
                    
                        | 53 | Technical secondary school, did not graduate | 
                                    
                    
                        | 54 | Technical secondary school, other | 
                                    
                    
                        | 61 | Associate (two year college), attending | 
                                    
                    
                        | 62 | Associate (two year college), completed | 
                                    
                    
                        | 63 | Associate (two year college), did not graduate | 
                                    
                    
                        | 64 | Associate (two year college), other | 
                                    
                    
                        | 71 | College, attending | 
                                    
                    
                        | 72 | College, completed | 
                                    
                    
                        | 73 | College, did not graduate | 
                                    
                    
                        | 74 | College, other | 
                            
            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.