Ivabradine was associated with a similar relative risk reduction of the composite outcome in the three SBP groups -LSB- SBP < @ mmHg , hazard ratio ( HR ) = @ , @ % confidence interval ( CI ) @-@ @ ; @ SBP < @ mmHg , HR = @ , @ % CI @ to @ ; SBP @ mmHg , HR = @ , @ % CI @ to @ ; P interaction = @ -RSB- .