No difference was found in glomerular filtration rates ( in mL/min/1 .73 m2 ) between treatment and control groups at 1-year follow-up ( 89.29 vs 87.94 mL/min/1 .73 m2 ; P = .58 ) or at 1.5-year follow-up ( 88.54 vs 90.25 mL/min/1 .73 m2 ; P = .51 ) .