Figure 1From: Nomograms of Iranian fetal middle cerebral artery Doppler waveforms and uniformity of their pattern with other populations' nomograms (A) Individual measurements and calculated reference ranges for the resistive index (RI) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.386, P = 0.000). (B) Individual measurements and calculated reference ranges for the pulsatility index (PI) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.340, P = 0.000). (C) Individual measurements and calculated reference ranges for the systolic to diastolic ratio (S/D ratio) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.334, P = 0.000). (D) Individual measurements and calculated reference ranges for the peak systolic velocity (PSV) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.535, P = 0.000).Back to article page