| Value | Category | 
                                    
                    
                        | -3 | Missing | 
                                    
                    
                        | 1 | No other person at any time | 
                                    
                    
                        | 2 | 1+ persons for part of the interview | 
                                    
                    
                        | 3 | 1+ persons for all of the interview | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.