The primary outcome occurred in 347 of 5033 patients ( 6.9 % ) in the thrombectomy group versus 351 of 5030 patients ( 7.0 % ) in the PCI-alone group ( hazard ratio in the thrombectomy group , 0.99 ; 95 % confidence interval [ CI ] , 0.85 to 1.15 ; P = 0.86 ) .