| Value | Category | 
                                    
                    
                        | 1 | Less than 15 minutes | 
                                    
                    
                        | 2 | Between 15 and 30 minutes | 
                                    
                    
                        | 3 | Between 31 and 60 minutes | 
                                    
                    
                        | 4 | More than 60 minutes | 
                                    
                    
                        | 5 | Don?t know | 
                            
            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.