| Value | Category | 
                                    
                    
                        | . |  | 
                                    
                    
                        | Dental |  | 
                                    
                    
                        | Environmental health services |  | 
                                    
                    
                        | General cleaning and laying of beds |  | 
                                    
                    
                        | On strike |  | 
                            
            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.