Mean ( sd ) weight-for-age z-scores and MUAC z-scores were -1.51 ( 1.29 ) versus -0.90 ( 0.88 ) versus -0.33 ( 1.15 ) and -1.56 ( 1.25 ) versus -1.24 ( 0.97 ) versus -0.65 ( 1.06 ) in ART-naive versus - experienced versus controls , respectively ( all P < 0.02 ) .