The primary-outcome rates were similar among 493 women assigned to less-tight control and 488 women assigned to tight control ( 31.4 % and 30.7 % , respectively ; adjusted odds ratio , 1.02 ; 95 % confidence interval [ CI ] , 0.77 to 1.35 ) , as were the rates of serious maternal complications ( 3.7 % and 2.0 % , respectively ; adjusted odds ratio , 1.74 ; 95 % CI , 0.79 to 3.84 ) , despite a mean diastolic blood pressure that was higher in the less-tight-control group by 4.6 mm Hg ( 95 % CI , 3.7 to 5.4 ) .