For mean changes from baseline , phosphorus levels decreased similarly in the ferric citrate and active control groups ( -2.041.99 [ SD ] vs -2.182.25 mg/dL , respectively ; P = 0.9 ) ; serum calcium levels increased similarly in the ferric citrate and active control groups ( 0.220.90 vs 0.310.95 mg/dL ; P = 0.2 ) .