| Value | Category | 
                                    
                    
                        | 1 | P1 | 
                                    
                    
                        | 2 | P2 | 
                                    
                    
                        | 3 | P3 | 
                                    
                    
                        | 4 | P4 | 
                                    
                    
                        | 5 | P5 | 
                                    
                    
                        | 6 | P6 | 
                                    
                    
                        | 7 | P7 or P8 | 
                                    
                    
                        | 8 | S1 | 
                                    
                    
                        | 9 | S2 | 
                                    
                    
                        | 10 | S3 | 
                                    
                    
                        | 11 | S4 | 
                                    
                    
                        | 12 | A1 | 
                                    
                    
                        | 13 | A2 | 
                                    
                    
                        | 14 | U1 | 
                                    
                    
                        | 15 | U2 | 
                                    
                    
                        | 16 | U3 | 
                                    
                    
                        | 17 | U4 | 
                                    
                    
                        | 18 | U5 | 
                                    
                    
                        | 19 | U6 | 
                                    
                    
                        | 20 | U7 | 
                                    
                    
                        | 21 | U8 | 
                                    
                    
                        | 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.