RESULTS	All-cause mortality at follow-up was 33 % in the overall cohort , with significantly fewer deaths occurring in the elective IABP group ( n = 42 ) than in the group that underwent PCI without planned IABP support ( n = 58 ) ( hazard ratio , 0.66 ; 95 % confidence interval , 0.44-0 .98 ; P = 0.039 ) .\