| Value | Category | 
                                    
                    
                        | 0 | zero | 
                                    
                    
                        | 1 | one | 
                                    
                    
                        | 2 | two | 
                                    
                    
                        | 3 | three | 
                                    
                    
                        | 4 | four | 
                                    
                    
                        | 5 | five | 
                                    
                    
                        | 6 | six | 
                                    
                    
                        | 7 | seven | 
                                    
                    
                        | 8 | eight | 
                                    
                    
                        | 9 | nine | 
                                    
                    
                        | 10 | ten | 
                                    
                    
                        | 11 | eleven | 
                                    
                    
                        | 12 | twelve | 
                                    
                    
                        | 13 | thirteen | 
                                    
                    
                        | 14 | fourteen | 
                                    
                    
                        | 15 | fifteen | 
                                    
                    
                        | 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.