We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleCardiorespiratory fitness levels among us adults 20-49 years of age: findings from the 1999-2004 National Health and Nutrition Examination Survey.AuthorsWang C; Haskell WL; Farrell SW; LaMonte MJ; Blair SN; Curtin LR; Hughes JP; Burt VLPublicationAmerican Journal of Epidemiology, 2010, Vol 171, Issue 4, p426ISSN0002-9262Publication typearticleDOI10.1093/aje/kwp412