groups were comparable in age ( c , 50 +/- 15 years ; bb , 51 +/- 13 years ) , gender ( c , 76 % male ; bb , 56 % male ) , entry functional class ( c , 2.8 +/- 0.8 ; bb , 2.7 +/- 0.7 ) , and left ventricular ejection fraction ( c , 27 +/- 12 % ; bb , 29 +/- 10 % ) .
C0079399
gender
C0086582
male