| Value | Category | 
                                    
                    
                        | 0 | none | 
                                    
                    
                        | 1 | standard 1 | 
                                    
                    
                        | 2 | standard 2 | 
                                    
                    
                        | 3 | standard 3 | 
                                    
                    
                        | 4 | standard 4 | 
                                    
                    
                        | 5 | standard 5 | 
                                    
                    
                        | 6 | standard 6 | 
                                    
                    
                        | 7 | standard 7 | 
                                    
                    
                        | 8 | standard 8 | 
                                    
                    
                        | 9 | form 1 | 
                                    
                    
                        | 10 | form 2 | 
                                    
                    
                        | 11 | form 3 | 
                                    
                    
                        | 12 | form 4 | 
                                    
                    
                        | 13 | non-university level post-secondary studies, technical/voc | 
                                    
                    
                        | 14 | professional bachelor's diploma (3 years | 
                                    
                    
                        | 15 | bachelor's degree (4-5 years) | 
                                    
                    
                        | 16 | master's degree | 
                                    
                    
                        | 17 | doctor's degree | 
                                    
                    
                        | 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.