| Value | Category | 
                                    
                    
                        | 0 | Not applicable (less than five years old) | 
                                    
                    
                        | 1 | Grade 1/Sub A | 
                                    
                    
                        | 2 | Grade 2/Sub B | 
                                    
                    
                        | 3 | Grade 3/Standard 1 | 
                                    
                    
                        | 4 | Grade 4/Standard 2 | 
                                    
                    
                        | 5 | Grade 5/Standard 3 | 
                                    
                    
                        | 6 | Grade 6/Standard 4 | 
                                    
                    
                        | 7 | Grade 7/Standard 5 | 
                                    
                    
                        | 8 | Grade 8/Standard 6/Form 1 | 
                                    
                    
                        | 9 | Grade 9/Standard 7/Form 2 | 
                                    
                    
                        | 10 | Grade 10/Standard 8/Form 3/NTCI | 
                                    
                    
                        | 11 | Grade 11/Standard 9/Form 4/NTCII | 
                                    
                    
                        | 12 | Grade 12/Standard 10/Form 5/Matric/NTCIII | 
                                    
                    
                        | 13 | Certificate with less than Grade 12 | 
                                    
                    
                        | 14 | Diploma with less than Grade 12 | 
                                    
                    
                        | 15 | Certificate with Grade 12 | 
                                    
                    
                        | 16 | Diploma with Grade 12 | 
                                    
                    
                        | 17 | Bachelors Degree | 
                                    
                    
                        | 18 | Bachelors Degree & Diploma | 
                                    
                    
                        | 19 | Honours Degree | 
                                    
                    
                        | 20 | Higher Degree (Masters, Doctorate) | 
                                    
                    
                        | 99 | No schooling | 
                            
            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.