| Value | 
                    Category | 
                                                                            
                                    
                    
                         | 
                        Option not selected  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 4 | 
                        Training center/course, private  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 6 | 
                        Self-trained  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 88 | 
                        Other, specify  | 
                        
                            
                        
                        
                        
                        
                            
                    
                            
            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.