| Value | Category | 
                                    
                    
                        | 1 | Involved, Important | 
                                    
                    
                        | 2 | Involved, Not Important | 
                                    
                    
                        | 3 | Not Involved | 
                                    
                    
                        | 4 | Method Not Applicable | 
                                    
                    
                        | 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.