| Value | Category | 
                                    
                    
                        | 1 | Away from home during complete survey period | 
                                    
                    
                        | 2 | Illness | 
                                    
                    
                        | 3 | Deformity | 
                                    
                    
                        | 4 | Other (specify) | 
                                    
                    
                        | 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.