Multivariable adjusted eGFR was associated with similar mortality risk before ( Hazard Ratio ( HR ) ( eGFR 10 ml increase ) : 0.94 ( 95 % CI : 0.89-0 .99 , P = 0.024 ) and after ( HR ( eGFR 10 ml increase ) : 0.93 ( 0.89-0 .99 ) , P = 0.012 ) adjustment for RF ( HR : 1.57 ( 1.28-1 .93 ) , P < 0.001 ) .