| Value | Category | 
                                    
                    
                        | 0 | never | 
                                    
                    
                        | 1 | occasionally//sometimes/rarely | 
                                    
                    
                        | 2 | frequently/often | 
                                    
                    
                        | 3 | always | 
                                    
                    
                        | 5 | Don't know | 
                                    
                    
                        | 99 | missing data | 
                            
            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.