| Value | Category | 
                                    
                    
                        | -9 | Dont know | 
                                    
                    
                        | -8 | Refused | 
                                    
                    
                        | -7 | Never worked | 
                                    
                    
                        | -5 | Not applicable | 
                                    
                    
                        | -3 | Missing | 
                                    
                    
                        | 0 | Armed forces occupations | 
                                    
                    
                        | 1 | Managers | 
                                    
                    
                        | 2 | Professionals | 
                                    
                    
                        | 3 | Technicians and associate professionals | 
                                    
                    
                        | 4 | Clerical support workers | 
                                    
                    
                        | 5 | Service and sales workers | 
                                    
                    
                        | 6 | Skilled agricultural, forestry and fishery workers | 
                                    
                    
                        | 7 | Craft and related trades workers | 
                                    
                    
                        | 8 | Plant and machine operators, and assemblers | 
                                    
                    
                        | 9 | Elementary occupations | 
                                    
                    
                        | 10 | Never worked | 
                                    
                    
                        | 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.