![]() ![]() The Intraclass correlation coefficients at each site were 0.51, 0.59 and 0.67, respectively. Results: The mean percentage of PI difference between arteries was 15.2, 14.5 and 22% at the placental end, free-loop and perivesical site, respectively. ![]() Reliability analyses were performed between observers and between arteries at each sampling site. The PI was calculated by two independent operators from both umbilical arteries at the placental end, at a free-floating loop and at the perivesical segment. ![]() Methods: One hundred consecutive singleton pregnancies between 24 and 40 weeks were included. Objectives: To analyse the inter-observer and inter-artery reliability of the umbilical artery (UA) pulsatility index (PI) at different sampling sites.
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