We found trends toward increased graft failure in recipients who were 70 years or older compared with those younger than 60 years ( 29 % vs 19 % ; HR , 1.2 [ 99 % CI , 0.7-2 .1 ] ; P = .04 ) or were African American ( HR , 1.5 ; P = .11 ) or who had a history of smoking ( 35 % vs 24 % ; HR , 1.6 [ 99 % CI , 0.9-2 .8 ] ; P = .02 ) .