| Value | 
                    Category | 
                                    
                                                        
                        | 0 | 
                        0 PPM (no iodine) | 
                                            
                                                        
                        | 7 | 
                        Below 15 PPM | 
                                            
                                                        
                        | 15 | 
                        15 PPM and above | 
                                            
                                                        
                        | 30 | 
                        30 PPM | 
                                            
                                                        
                        | 994 | 
                        Salt not tested | 
                                            
                                                        
                        | 995 | 
                        No salt in household | 
                                            
                            
            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.