| Value | Category | 
                                    
                    
                        | 0 | no schooling | 
                                    
                    
                        | 1 | sub a, grade 1 | 
                                    
                    
                        | 2 | sub b, grade 2 | 
                                    
                    
                        | 3 | std 1, grade 3 | 
                                    
                    
                        | 4 | std 2, grade 4 | 
                                    
                    
                        | 5 | std 3, grade 5 | 
                                    
                    
                        | 6 | std 4, grade 6 | 
                                    
                    
                        | 7 | std 5, grade 7 | 
                                    
                    
                        | 8 | std 6, form 1, grade 8 | 
                                    
                    
                        | 9 | std 7, form 2, grade 9 | 
                                    
                    
                        | 10 | std 8, form 3, grade 10 | 
                                    
                    
                        | 11 | std 9, form 4, grade 11 | 
                                    
                    
                        | 12 | std 10, form 5, grade 12 | 
                                    
                    
                        | 13 | ntc i | 
                                    
                    
                        | 14 | ntc ii | 
                                    
                    
                        | 15 | ntc iii | 
                                    
                    
                        | 16 | diploma, certificate with less than std 10,  grade 12 | 
                                    
                    
                        | 17 | diploma, certificate with std 10,  grade 12 | 
                                    
                    
                        | 18 | bachelors degree or equivalent | 
                                    
                    
                        | 19 | other, specify | 
                                    
                    
                        | 99 | dont know , no answer | 
                            
            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.