| Value | 
                    Category | 
                                                                            
                                    
                    
                        | 0 | 
                        0 ppm (no iodine)  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 7 | 
                        Below 15 ppm  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 15 | 
                        15 ppm or more  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 30 | 
                        30 ppm  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 994 | 
                        Salt not tested  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 995 | 
                        No salt  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 997 | 
                        Not dejure resident  | 
                        
                            
                        
                        
                        
                        
                            
                    
                            
            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.