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  • Title: Impact of maternal weight on the intra-observer and inter-observer reproducibility of fetal ultrasonography measurements in the third trimester.
    Author: Policiano C, Mendes JM, Fonseca A, Barros J, Martins D, Reis I, Clode N, Graça LM.
    Journal: Int J Gynaecol Obstet; 2018 Jan; 140(1):53-59. PubMed ID: 28960294.
    Abstract:
    OBJECTIVE: To evaluate the effect of maternal weight on the intra- and inter-observer reproducibility of third-trimester ultrasonography fetal measurements. METHODS: The present prospective study, performed at a tertiary hospital, enrolled patients at between 35+0  weeks and 36+6  weeks of singleton pregnancies between January 1, 2015, and July 1, 2016. Fetal ultrasonography measurements were evaluated twice by a first observer and a third time by a second observer. Intra- and inter-observer consistency were analyzed using the Cronbach α reliability coefficient, and measurement reproducibility was compared with patients stratified by a body mass index (BMI, calculated as weight in kilograms divided by the square of height in meters) of below 25 or at least 25. RESULTS: The study included 197 patients (133 with BMI <25 and 64 with BMI ≥25). Among patients with a BMI below 25, the reliability coefficients for bi-parietal diameter, head circumference, abdominal circumference, and femur length measurements were 0.97, 0.95, 0.98, and 0.96, respectively, for intra-observer consistency, and were 0.97, 0.93, 0.98, and 0.95, respectively, for inter-observer consistency. Among patients with a BMI of at least 25, these values were 0.97, 0.96, 0.98, and 0.97, respectively, for intra-observed consistency, and 0.97, 0.94, 0.98, and 0.96, respectively, for inter-observer consistency. CONCLUSION: High intra- and inter-observer reproducibility was observed for third-trimester fetal ultrasonography measurements, including for patients who were overweight.
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