The visit-to-visit variability of both systolic blood pressure ( SBP ) and diastolic blood pressure ( DBP ) was independently associated with the occurrence of stroke [ SD : the hazard ratios ( 95 % confidence intervals ) of SBP and DBP were 1.042 ( 1.021 to 1.064 ) and 1.052 ( 1.040 to 1.065 ) ; CV : the hazard ratios ( 95 % confidence intervals ) of SBP and DBP were 1.183 ( 1.010 to 1.356 ) and 1.151 ( 1.005 to 1.317 ) , respectively ] .