| Value | 
                    Category | 
                                                                            
                                    
                    
                        | -5 | 
                        Missing; Unknown;  Inappropiate  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | -4 | 
                        Not asked  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | -3 | 
                        Not applicable  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | -2 | 
                        No answer  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | -1 | 
                        Don´t know  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 1 | 
                        None  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 2 | 
                        Less than Primary  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 3 | 
                        Primary  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 4 | 
                        Less than Secondary technical/vocational  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 5 | 
                        Secondary technical/vocational  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 6 | 
                        Less than Secondary university preparatory  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 7 | 
                        Secondary university preparatory  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 8 | 
                        Some university education  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 9 | 
                        University degree  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 99 | 
                        DK/NA  | 
                        
                            
                        
                        
                        
                        
                            
                    
                                    
                    
                        | 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.