Source: Olin GL, Rhoades JA. The five most costly medical conditions, 1997 and 2002: estimates for the U.S. civilian noninstitutionalized population. Statistical Brief #80. Agency for Healthcare Research and Quality, Rockville, MD. Web site: http://www.meps.ahrq.gov/mepsweb/data_files/publications/st80/stat80.pdf. Accessed April 7, 2006.