We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDifferences in Physical Activity Prevalence and Trends From 3 U.S. Surveillance Systems: NHIS, NHANES, and BRFSS.AuthorsCarlson, Susan A.; Densmore, Dianna; Fulton, Janet E.; Yore, Michelle M.; Kohl, III, Harold W.PublicationJournal of Physical Activity & Health, 2009, Vol 6, pS18ISSN1543-3080Publication typearticleDOI10.1123/jpah.6.s1.s18