| Value | Category | 
                                    
                    
                        | 1 | 1. Hadn’t thought about it | 
                                    
                    
                        | 2 | 2. Don’t think it’s necessary | 
                                    
                    
                        | 3 | 3. Find difficult to change behaviour | 
                                    
                    
                        | 8 | 8. Other | 
                            
            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.