In the per protocol analysis , the difference in virological failure for HIV-@ RNA > @ copies/mL ( @ of @ patients in the PI group and two of @ patients in the NRTI group ) and for HIV-@ RNA > @ copies/mL ( two of @ and three of @ patients , respectively ) was +@ percentage points ( @ % CI -@ to +@ percentage points ) and +@ percentage points ( @ % CI -@ to +@ percentage points ) , respectively , also showing noninferiority .