| Value | Category | 
                                    
                    
                        | 1 | NONE | 
                                    
                    
                        | 2 | PSLC | 
                                    
                    
                        | 3 | JCE | 
                                    
                    
                        | 4 | MSCE | 
                                    
                    
                        | 5 | NON-UNIV. DIPLOMA | 
                                    
                    
                        | 6 | UNIVER. DIPLOMA, DEGREE | 
                                    
                    
                        | 7 | POST-GRAD | 
                                    
                    
                        | 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.