| Value | Category | 
                                    
                    
                        | 9996 | 9996. Exceeds max measurement possible | 
                                    
                    
                        | 9997 | 9997. Respondent disabled | 
                                    
                    
                        | 9998 | 9998. Refused | 
                            
            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.