We examined changes in urine protein : creatinine ( UPCR ) and urine albumin : creatinine ( UACR ) ratios in @ ART-naive participants in A@ randomized in a substudy to blinded NRTI ( abacavir/lamivudine , ABC/@TC , n = @ or TDF/emtricitabine , TDF/FTC , n = @ ) with open-label protease inhibitor ( PI ) atazanavir/ritonavir or nonnucleoside reverse transcriptase inhibitor ( NNRTI ) efavirenz .