| Value | Category | Cases | |
|---|---|---|---|
| 1 | 11 years old or younger | 28 | 
                                    
                                    1.1%
                                 | 
| 2 | 12 years old | 90 | 
                                    
                                    3.5%
                                 | 
| 3 | 13 years old | 354 | 
                                    
                                    13.9%
                                 | 
| 4 | 14 years old | 537 | 
                                    
                                    21.1%
                                 | 
| 5 | 15 years old | 512 | 
                                    
                                    20.1%
                                 | 
| 6 | 16 years old | 469 | 
                                    
                                    18.5%
                                 | 
| 7 | 17 years old | 269 | 
                                    
                                    10.6%
                                 | 
| 8 | 18 years old or older | 283 | 
                                    
                                    11.1%
                                 | 
| Sysmiss | 37 |