| Value | Category | 
                                    
                    
                        | 1 | Sans niveau | 
                                    
                    
                        | 2 | Primaire | 
                                    
                    
                        | 3 | Secondaire 1er cycle | 
                                    
                    
                        | 4 | Secondaire 2nd cycle | 
                                    
                    
                        | 5 | Supérieur | 
                                    
                    
                        | 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.