Silver Book Fact
More than 26 million Americans between the ages of 20 and 64 experience frequent back pain.
Centers for Disease Control and Prevention, National Center for Health Statistics. Health, United States, 2006: With chartbook on trends in the health of Americans. Atlanta, GA: Centers for Disease Control and Prevention; 2006. http://www.cdc.gov/nchs/data/hus/hus06.pdf