Chronic conditions are the leading cause of death and disability in both the United States and California, where 36% of adults and 16% of children had at least one chronic health condition in 2007.The toll is both human and economic. Treating these conditions accounts for more than 70% of all U.S. medical costs. To look specifically at California, an online data center provides an interactive view of the core data sets from the Chronic Conditions of Californians report. To view the data center and download the report, please click here.