| Value | 
                    Category | 
                                                                            
                                    
                    
                        | 0 | 
                        0 ppm (no iodine)  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 7 | 
                        7 ppm  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 15 | 
                        15 ppm  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 30 | 
                        30 ppm  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 994 | 
                        salt not tested  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 995 | 
                        no salt  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 997 | 
                        not dejure resident  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1000000001 | 
                        .Z  | 
                        
                            
                        
                        
                        
                        
                            
                    
                            
            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.