*DXA = dual-energy x-ray absorptiometry; QB = quarterbacks; RB = running backs; TE = tight ends; LB = linebackers; DB = defensive backs; PK = punters/kickers; DL = defensive linemen; OL = offensive linemen; WR = wide receivers. †Significantly less than OL and DL. z§Significantly greater than DB and significantly less than OL.Significantly less than OL only. kSignificantly less than TE and LB.