Expected-value bias in routine third-trimester growth scans.

ABSTRACT:

Objectives

Operators performing fetal growth scans are usually aware of the gestational age of the pregnancy, which may lead to expected-value bias when performing biometric measurements. We aimed to evaluate the incidence of expected-value bias in routine fetal growth scans and assess its impact on standard biometric measurements.

Methods

We collected prospectively full-length video recordings of routine ultrasound growth scans coupled with operator eye tracking. Expected value was defined as the gestational age at the time of the scan, based on the estimated due date that was established at the dating scan. Expected-value bias was defined as occurring when the operator looked at the measurement box on the screen during the process of caliper adjustment before saving a meas

SUBMITTER: Drukker L 

PROVIDER: S-EPMC7079033 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature