| Value | Category | 
                                    
                    
                        | 1 | Less than G.C.E.(O/L0 | 
                                    
                    
                        | 2 | G.C.E.(O/L) | 
                                    
                    
                        | 3 | G.C.E.(A/L) | 
                                    
                    
                        | 4 | Degree or Equivalent | 
                                    
                    
                        | 5 | Masters or Equivalent | 
                                    
                    
                        | 6 | MPhil  or Equivalent | 
                                    
                    
                        | 7 | Phd or Equivalent | 
                            
            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.