| Value | Category | 
                                    
                    
                        | 1 | 5 HOURS OR MORE | 
                                    
                    
                        | 2 | 3-5 HOURS | 
                                    
                    
                        | 3 | 1-3 HOURS | 
                                    
                    
                        | 4 | UP TO 1 HOUR | 
                                    
                    
                        | 5 | NO TIME | 
                                    
                    
                        | 9 | OMITTED | 
                                    
                    
                        | 11 | .A | 
                            
            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.