From the Centers for Disease Control and Prevention:
QuickStats: FROM THE NATIONAL CENTER FOR HEALTH STATISTICS Percentage of Adults Aged 18 Years Who Had Some Form of Arthritis or a Related Condition,* by Race/Ethnicity and Hispanic Subpopulation—National Health Interview Survey, United States, 2009
Effect of Glucosamine on Pain-Related Disability in Patients With Chronic Low Back Pain and Degenerative Lumbar Osteoarthritis:
A Randomized Controlled Trial