| Value | Category | 
                                    
                    
                        | 10 | correct | 
                                    
                    
                        | 70 | incorrect | 
                                    
                    
                        | 71 | incorrect2 | 
                                    
                    
                        | 72 | incorrect3 | 
                                    
                    
                        | 73 | incorrect4 | 
                                    
                    
                        | 90 | crossed out,... | 
                                    
                    
                        | 98 | not admin. | 
                                    
                    
                        | 99 | missing | 
                                    
                    
                        | 101 | .A | 
                            
            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.