The mean ( SD ) change in systolic blood pressure at @ months was -@ mm Hg in the denervation group as compared with -@ mm Hg in the sham-procedure group ( P < @ for both comparisons of the change from baseline ) , for a difference of -@ mm Hg ( @ % confidence interval -LSB- CI -RSB- , -@ to @ ; P = @ for superiority with a margin of @ mm Hg ) .