At @ year , the rates of death of any cause ( @ % vs. @ % ; relative risk -LSB- RR -RSB- : @ ; @ % confidence interval -LSB- CI -RSB- : @ to @ ; p = @ ) and of cardiovascular causes ( @ % vs. @ % ; RR : @ ; @ % CI : @ to @ ; p = @ ) were not statistically significantly different in the balloon - and self-expandable groups , respectively .