Cumulative probabilities of this outcome were @ % ( @ % confidence interval , @-@ @ ) versus @ % ( @-@ @ ) in the endarterectomy group at the @-year follow-up ( hazard ratio , @ ; @-@ @ ; P = @ ) and @ % ( @-@ @ ) versus @ % ( @-@ @ ; hazard ratio , @ ; @-@ @ ; P = @ ) at the @-year follow-up .