In pairwise comparisons , the risk of the primary outcome was significantly higher in the femoral group than in the subclavian group ( hazard ratio , 3.5 ; 95 % confidence interval [ CI ] , 1.5 to 7.8 ; P = 0.003 ) and in the jugular group than in the subclavian group ( hazard ratio , 2.1 ; 95 % CI , 1.0 to 4.3 ; P = 0.04 ) , whereas the risk in the femoral group was similar to that in the jugular group ( hazard ratio , 1.3 ; 95 % CI , 0.8 to 2.1 ; P = 0.30 ) .