| Value | Category | 
                                    
                    
                        | 1 | Office/factory | 
                                    
                    
                        | 2 | Farm | 
                                    
                    
                        | 3 | Home | 
                                    
                    
                        | 4 | In the field   door to door | 
                                    
                    
                        | 5 | Vehicle | 
                                    
                    
                        | 6 | Street, flea market | 
                                    
                    
                        | 7 | Other | 
                                    
                    
                        | 99889988 | REFUSAL | 
                                    
                    
                        | 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.