We found trends toward increased graft failure in recipients who were @ years or older compared with those younger than @ years ( @ % vs @ % ; HR , @ -LSB- @ % CI , @-@ @ -RSB- ; P = @ ) or were African American ( HR , @ ; P = @ ) or who had a history of smoking ( @ % vs @ % ; HR , @ -LSB- @ % CI , @-@ @ -RSB- ; P = @ ) .