| State | ||||||||
| Analysis of Adolescent Substance Abuse Clients by Age | ||||||||
| Source: IDHW Client Information System | ||||||||
| 1999-2000 | 2000-2001 | 2001-2002 | 2002-2003 | 2005 | 2006 | 2007 | 2008 | |
| Under 10 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 10-14 | 141 | 144 | 158 | 165 | 79 | 89 | 72 | 117 |
| 15-17 | 708 | 906 | 964 | 798 | 606 | 631 | 656 | 1093 |