| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never used drugs | 2179 | 
                                    
                                    92.1%
                                 | 
| 2 | 7 years old or younger | 77 | 
                                    
                                    3.3%
                                 | 
| 3 | 8 or 9 years old | 33 | 
                                    
                                    1.4%
                                 | 
| 4 | 10 or 11 years old | 18 | 
                                    
                                    0.8%
                                 | 
| 5 | 12 or 13 years old | 22 | 
                                    
                                    0.9%
                                 | 
| 6 | 14 or 15 years old | 21 | 
                                    
                                    0.9%
                                 | 
| 7 | 16 or 17 years old | 12 | 
                                    
                                    0.5%
                                 | 
| 8 | 18 years old or older | 4 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 213 |