| Value | Category | 
                                    
                    
                        | -99 | Refused to answer | 
                                    
                    
                        | -88 | Not provided | 
                                    
                    
                        | -77 | Not applicable | 
                                    
                    
                        | -66 | Do not know | 
                                    
                    
                        | 1 | None | 
                                    
                    
                        | 2 | 1 | 
                                    
                    
                        | 3 | 2-5 | 
                                    
                    
                        | 4 | More than 5 | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.