| Value | Category | 
                                    
                    
                        | -8 |  | 
                                    
                    
                        | 1 | One visit in face-to-face interview with one person | 
                                    
                    
                        | 2 | One visit in face-to-face interview with different managers | 
                                    
                    
                        | 3 | Several visits | 
                            
            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.