| Value | Category | 
                                    
                    
                        | 100 | Zero hours | 
                                    
                    
                        | 101 |  | 
                                    
                    
                        | 102 |  | 
                                    
                    
                        | 103 |  | 
                                    
                    
                        | 104 |  | 
                                    
                    
                        | 105 |  | 
                                    
                    
                        | 201 | One day | 
                                    
                    
                        | 202 |  | 
                                    
                    
                        | 203 |  | 
                                    
                    
                        | 204 |  | 
                                    
                    
                        | 205 |  | 
                                    
                    
                        | 206 |  | 
                                    
                    
                        | 301 | One week | 
                                    
                    
                        | 302 |  | 
                                    
                    
                        | 303 |  | 
                                    
                    
                        | 304 |  | 
                                    
                    
                        | 305 |  | 
                                    
                    
                        | 306 |  | 
                                    
                    
                        | 307 |  | 
                                    
                    
                        | 308 |  | 
                                    
                    
                        | 312 |  | 
                                    
                    
                        | 998 | dk | 
                                    
                    
                        | 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.