In multivariate Cox analyses , adjusting for significant univariate predictors of mortality , compared with average SBP between 144 and 157 , an average SBP < 144 was a significant predictor of all-cause ( hazard ratio , 1.81 ; 95 % confidence interval , 1.20-2 .73 ) and cardiovascular mortality ( hazard ratio , 1.60 ; 95 % confidence interval , 1.02-2 .54 ) , whereas patients who had an average SBP > 157 had no significant increased risk of death .