Using hospital discharge data from 2003 to 2011, the Agency for Healthcare Research and Quality (AHRQ) studied trends in aggregate hospital costs, average hospital costs, and hospital utilization. The Agency found that for children aged 0–17, aggregate costs rose rapidly for the surgical hospitalizations and decreased for injury hospitalizations. Further, average hospital costs, or cost per discharge, increased at least 2% for all hospitalizations and were expected to grow by at least 4% through 2013. The exception to this was mental health hospitalizations, which saw a lower percentage increase of 1.2%, and was projected to increase only 0.9% through 2013. Despite the rising aggregate costs and costs per discharge, hospitalizations (except for mental health hospitalizations) for children aged 0–17 decreased over the same time, and were projected to continue decreasing.