At week 48 , 68 % in the ABC/3TC group vs. 67 % in the TDF/FTC group achieved an HIV-1 RNA below 50 copies/ml ( intent-to-treat exposed missing = failure , 95 % confidence interval on the difference -6.63 to 7.40 , P = 0.913 ) , demonstrating the noninferiority of ABC/3TC to TDF/FTC at week 48 .
