| Value | Category | 
                                    
                    
                        | 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.