| Value | Category | 
                                    
                    
                        | 0 | None or < ISCED 1 | 
                                    
                    
                        | 1 | ISCED 1 | 
                                    
                    
                        | 2 | ISCED 2 | 
                                    
                    
                        | 3 | ISCED 3 & 4A | 
                                    
                    
                        | 4 | ISCED 4B | 
                                    
                    
                        | 5 | ISCED 5 & 6 | 
                                    
                    
                        | 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.