| Value | Category | 
                                    
                    
                        | 1 | Hourly | 
                                    
                    
                        | 2 | Daily | 
                                    
                    
                        | 3 | Weekly | 
                                    
                    
                        | 4 | Every 15 days | 
                                    
                    
                        | 5 | Monthly | 
                                    
                    
                        | 6 | Quarterly | 
                                    
                    
                        | 7 | In time based on work performance | 
                                    
                    
                        | 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.