Ferric citrate increased hemoglobin levels ( from 10.5 0.8 to 11.0 1.0 g/dL ; P < 0.001 vs placebo ) , reduced urinary phosphate excretion 39 % ( P < 0.001 vs placebo ) , and reduced serum intact FGF-23 levels from a median of 159 ( IQR , 102-289 ) to 105 ( IQR , 65-187 ) pg/mL ( P = 0.02 vs placebo ) .