| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1.Do not test the pupils | 1 | 
                            
                             
                                
                                0.5%
                                                             
                            
                         | 
                        
                    
| 2 | 2.Once per year | 0 | 
                            
                             
                                
                                0%
                                                             
                            
                         | 
                        
                    
| 3 | 3.Once a term | 3 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    
| 4 | 4.Two or more times per term | 56 | 
                            
                             
                                
                                26.3%
                                                             
                            
                         | 
                        
                    
| 5 | 5.Once a month | 23 | 
                            
                             
                                
                                10.8%
                                                             
                            
                         | 
                        
                    
| 6 | 6.Two or more week | 130 | 
                            
                             
                                
                                61%
                                                             
                            
                         |