For the proportions of patients ( intention-to-treat ; missing = failure ) with HIV-@ RNA < @ copies/mL ( PI group , @ % ; ABC/@TC/ZDV group , @ % ) and < @ copies/mL ( PI group , @ % ; ABC/@TC/ZDV group , @ % ) at @ weeks , switching to ABC/@TC/ZDV was noninferior compared with continuing the PI regimen ; the difference in failure rate ( ABC/@TC/ZDV minus PI ) was -@ percentage points -LSB- @ % confidence interval ( CI ) -@ to +@ percentage points -RSB- and +@ percentage points ( @ % CI -@ to +@ percentage points ) , respectively .