| Value | Category | Cases | |
|---|---|---|---|
| 0 | received no inject. | 726 | 
                                                                 
                                    
                                    28%
                                 
                                                             | 
                                                        
                    
| 1 | 273 | 
                                                                 
                                    
                                    10.5%
                                 
                                                             | 
                                                        
                    |
| 2 | 280 | 
                                                                 
                                    
                                    10.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 371 | 
                                                                 
                                    
                                    14.3%
                                 
                                                             | 
                                                        
                    |
| 4 | 321 | 
                                                                 
                                    
                                    12.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 504 | 
                                                                 
                                    
                                    19.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 19 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 7+ | 17 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| 8 | don't know | 76 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    
| 9 | 8 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 11 | .Z | 5637 |