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- W2897524921 abstract "The primary aim of this study was to test the equivalence of two fetal weight estimation formulas generated by Hadlock: H1, a formula that includes head circumference (HC) parameter, and H2, which excludes it. The secondary aim was to identify the population in which H2 formula was less reliable to use. This study included 1220 sonographic fetal weight estimations performed within 7 days of delivery. Included cases were of singleton pregnancies, with 24 weeks gestation minimum. Cases of infants with congenital skeletal malformations were excluded. Estimated fetal weight (EFW) was calculated using H1 and H2 formulas. Their accuracies were compared using percent error, the proportion of EFWs falling within ±15% error interval, and by Bland-Altman (BA) analysis. Multivariate-regression was performed to evaluate risk factors affecting weight estimation by H2 formula. H2 formula presented with higher systemic mean percent error (4.30%) comparing to H1 (2.98%, p<0.001). Likewise, H2 manifested lower accuracy (87.95% prediction) comparing to H1 (92.21%). BA analysis demonstrated that 95% of cases were within (-142.03) – 231.79g (mean 44.88g). The risk factors found to be significant in the multivariate analysis of H2 formula are index birth number (OR 0.866, p<0.01), difference in days between sonographic weight estimation and birth day (OR 1.138, p<0.01), and EFW (OR 1.039, p<0.01). Hadlock formula that excludes head circumference can be used to predict the fetal weight at term when HC is difficult to measure. Extra caution should be put when dealing with lower index birth number, higher number of days between sonographic weight estimation and birth day, and higher EFWs. Supporting information can be found in the online version of this abstract Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
- W2897524921 created "2018-10-26" @default.
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- W2897524921 date "2018-10-01" @default.
- W2897524921 modified "2023-10-18" @default.
- W2897524921 title "EP05.03: Estimation of fetal weight using Hadlock's formulas: is head circumference an essential parameter?" @default.
- W2897524921 doi "https://doi.org/10.1002/uog.19833" @default.
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