| Value | Category | 
                                    
                    
                        | -9 | Don't Know | 
                                    
                    
                        | -8 | Refused | 
                                    
                    
                        | -5 | Not Applicable | 
                                    
                    
                        | -3 | Missing | 
                                    
                    
                        | 0 | None | 
                                    
                    
                        | 1 | 1 Night | 
                                    
                    
                        | 2 | 2 Nights | 
                                    
                    
                        | 3 | 3 Nights | 
                                    
                    
                        | 4 | 4 Nights | 
                                    
                    
                        | 5 | 5 Nights | 
                                    
                    
                        | 6 | 6 Nights | 
                                    
                    
                        | 7 | 7 Nights | 
                                    
                    
                        | 8 | 8 Nights | 
                                    
                    
                        | 9 | 9 Nights | 
                                    
                    
                        | 10 | 10 Nights | 
                                    
                    
                        | 11 | 11 Nights | 
                                    
                    
                        | 12 | 12 Nights | 
                                    
                    
                        | 13 | 13 Nights | 
                                    
                    
                        | 14 | 14 Nights | 
                                    
                    
                        | 15 | 15 Nights | 
                                    
                    
                        | 16 | 16 Nights | 
                                    
                    
                        | 17 | 17 Nights | 
                                    
                    
                        | 18 | 18 Nights | 
                                    
                    
                        | 19 | 19 Nights | 
                                    
                    
                        | 20 | 20 Nights | 
                                    
                    
                        | 21 | 21 Nights | 
                                    
                    
                        | 22 | 22 Nights | 
                                    
                    
                        | 23 | 23 Nights | 
                                    
                    
                        | 24 | 24 Nights | 
                                    
                    
                        | 25 | 25 Nights | 
                                    
                    
                        | 26 | 26 Nights | 
                                    
                    
                        | 27 | 27 Nights | 
                                    
                    
                        | 28 | 28 Nights | 
                                    
                    
                        | 29 | 29 Nights | 
                                    
                    
                        | 30 | 30 Nights | 
                                    
                    
                        | 31 | 31 Nights | 
                            
            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.