| Value | Category | 
                                    
                    
                        | 1 | Home visit | 
                                    
                    
                        | 2 | Radio broadcast | 
                                    
                    
                        | 3 | Printed bulletin | 
                                    
                    
                        | 4 | Newspaper article | 
                                    
                    
                        | 5 | Television program | 
                                    
                    
                        | 6 | Training | 
                                    
                    
                        | 7 | Other | 
                                    
                    
                        | 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.