| Value | Category | 
                                    
                    
                        | 1 | 1. More than 5 | 
                                    
                    
                        | 2 | 2. 5 | 
                                    
                    
                        | 3 | 3. 4 | 
                                    
                    
                        | 4 | 4. 3 | 
                                    
                    
                        | 5 | 5. 2 | 
                                    
                    
                        | 7 | 7. Not applicable | 
                                    
                    
                        | 8 | 8. Refuse to answer | 
                            
            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.