| Value | Category | 
                                    
                    
                        | 1 | 3 doses before 1 year and boster dose within 3 years | 
                                    
                    
                        | 2 | 1 to 3 doses bofore 1 year | 
                                    
                    
                        | 3 | No | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 5 |  | 
                                    
                    
                        | 6 |  | 
                                    
                    
                        | 8 |  | 
                                    
                    
                        | 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.