Umbilical artery

Before

After

p

RI (resistance index)

Min. - Max.

0.46 - 1.0

0.4 - 0.90

<0.001*

Mean ± SD.

0.69 ± 0.15

0.63 ± 0.12

Median

0.66

0.62

PI (pulsatility index)

Min. - Max.

0.6 - 2.16

0.40 - 2.0

<0.001*

Mean ± SD.

1.16 ± 0.43

1.05 ± 0.41

Median

1.08

1.0

SDR (Systolic-diastolic ratio)

Min. - Max.

0.7 - 7.80

0.8 - 6.33

< 0.001*

Mean ± SD.

3.30 ± 1.37

3.03 ± 1.11

Median

2.90

2.69