Silver Book Fact
Arthritis and other musculoskeletal conditions were the most frequently reported chronic conditions causing limitation of activity. Heart and circulatory conditions were the second leading cause of activity limitation.
Centers for Disease Control and Prevention. Health, United States, 2009. Hyattsville, MD: National Center for Health Statistics; 2009. http://www.cdc.gov/nchs/data/hus/hus09.pdf