| Value | Category | 
                                    
                    
                        | 1 | Currently Attending | 
                                    
                    
                        | 2 | Attended and left | 
                                    
                    
                        | 3 | Attended and graduated | 
                                    
                    
                        | 4 | Never attended | 
                            
            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.