| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | standard 1 | 
                                    
                    
                        | 2 | standard 2 | 
                                    
                    
                        | 3 | standard 3 | 
                                    
                    
                        | 4 | standard 4 | 
                                    
                    
                        | 5 | cbcc | 
                                    
                    
                        | 6 | other, specify | 
                                    
                    
                        | 7 | no schooling completed | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.