| Value | Category | 
                                    
                    
                        | 0 | Does not work | 
                                    
                    
                        | 1 | Armed forces | 
                                    
                    
                        | 11 | Public adm. managers | 
                                    
                    
                        | 12 | Industry mid-manager | 
                                    
                    
                        | 13 | Industry upper-mgmen | 
                                    
                    
                        | 21 | Math,engineer,physic | 
                                    
                    
                        | 22 | Biology,medic,health | 
                                    
                    
                        | 23 | Teaching profession | 
                                    
                    
                        | 24 | Other professionals | 
                                    
                    
                        | 31 | Engin.chem. techicic | 
                                    
                    
                        | 32 | Biolog.medic technic | 
                                    
                    
                        | 33 | Mid,auxiliary teachr | 
                                    
                    
                        | 34 | Other technicians | 
                                    
                    
                        | 41 | Office assistants | 
                                    
                    
                        | 42 | Deal with public | 
                                    
                    
                        | 51 | Personal services | 
                                    
                    
                        | 52 | Model,salesman,demo | 
                                    
                    
                        | 61 | Agricult.,fishermen | 
                                    
                    
                        | 62 | Agri,fish subsistenc | 
                                    
                    
                        | 71 | Extrac,construc oper | 
                                    
                    
                        | 73 | Graphic arts operato | 
                                    
                    
                        | 74 | Other operators | 
                                    
                    
                        | 81 | Fix install operator | 
                                    
                    
                        | 82 | Machine,mount operat | 
                                    
                    
                        | 83 | Vehicle,mobile drive | 
                                    
                    
                        | 91 | Unskill sales,servic | 
                                    
                    
                        | 92 | Unskill agric,fisher | 
                                    
                    
                        | 93 | Unskill mining,const | 
                                    
                    
                        | 96 | Other workers | 
                                    
                    
                        | 98 | DK | 
                            
            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.