| Value | Category | 
                                    
                    
                        | 1 | NO IN-SERVICE COURSE | 
                                    
                    
                        | 2 | NOT EFFECTIVE | 
                                    
                    
                        | 3 | REASONABLY EFFECTIVE | 
                                    
                    
                        | 4 | effective | 
                                    
                    
                        | 5 | VERY EFFECTIVE | 
                                    
                    
                        | 9 | omitted | 
                            
            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.