| Value | Category | 
                                    
                    
                        | 0 | no | 
                                    
                    
                        | 1 | respondent drunk only | 
                                    
                    
                        | 2 | partner drunk only | 
                                    
                    
                        | 3 | both drunk | 
                                    
                    
                        | 4 | neither drunk but consumed alcohol | 
                                    
                    
                        | 1000000001 | .Z | 
                            
            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.