Mean systolic blood pressure was reduced from @ mm Hg to @ mm Hg ( -@ % ) within @ hours in the antihypertensive treatment group and from @ mm Hg to @ mm Hg ( -@ % ) in the control group within @ hours after randomization ( difference , -@ % -LSB- @ % CI , -@ to -@ % -RSB- ; absolute difference , -@ mm Hg -LSB- @ % CI , -@ to -@ -RSB- ; P < @ ) .