| Value | Category | 
                                    
                    
                        | 0 | Never used | 
                                    
                    
                        | 1 | Used only folkloric | 
                                    
                    
                        | 2 | Used only trad. meth | 
                                    
                    
                        | 3 | Used modern method | 
                                    
                    
                        | 8 |  | 
                                    
                    
                        | 9 |  | 
                            
            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.