| Value | Category | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 1 | More boys than girls | 
                                    
                    
                        | 2 | More girls than boys | 
                                    
                    
                        | 3 | Equaliy boys and girls | 
                                    
                    
                        | 9 |  | 
                                    
                    
                        | 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.