| Value | Category | 
                                    
                    
                        | 1 | Educational or vocational training activities | 
                                    
                    
                        | 2 | Household activities | 
                                    
                    
                        | 3 | Retired / old age | 
                                    
                    
                        | 4 | Physical illness / Disabled | 
                                    
                    
                        | 9 | Other | 
                                    
                    
                        | 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.