| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never used drugs | 3561 | 
                                    
                                    98%
                                 | 
| 2 | 7 years old or younger | 11 | 
                                    
                                    0.3%
                                 | 
| 3 | 8 or 9 years old | 5 | 
                                    
                                    0.1%
                                 | 
| 4 | 10 or 11 years old | 5 | 
                                    
                                    0.1%
                                 | 
| 5 | 12 or 13 years old | 14 | 
                                    
                                    0.4%
                                 | 
| 6 | 14 or 15 years old | 25 | 
                                    
                                    0.7%
                                 | 
| 7 | 16 or 17 years old | 13 | 
                                    
                                    0.4%
                                 | 
| 8 | 18 years old or older | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 49 |