Normalized cardiac output 5 min after induction was greater in the norepinephrine group versus the phenylephrine group ( median 102.7 % [ interquartile range , 94.3 to 116.7 % ] versus 93.8 % [ 85.0 to 103.1 % ] , P = 0.004 , median difference 9.8 % , 95 % CI of difference between medians 2.8 to 16.1 % ) .