| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never used drugs | 3531 | 
                                                                 
                                    
                                    96.4%
                                 
                                                             | 
                                                        
                    
| 2 | 7 years old or younger | 21 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 3 | 8 or 9 years old | 21 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 4 | 10 or 11 years old | 10 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 5 | 12 or 13 years old | 10 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 6 | 14 or 15 years old | 18 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    
| 7 | 16 or 17 years old | 23 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 8 | 18 years old or older | 30 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 142 |