JOURNAL OF SHANDONG UNIVERSITY (HEALTH SCIENCES) ›› 2017, Vol. 55 ›› Issue (1): 92-96.doi: 10.6040/j.issn.1671-7554.0.2016.703

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Estimation of birth weight of term fetus based on mathematical equations

ZHANG Man, MA Lin, KAN Yanmin   

  1. Department of Ultrasound, the North China University of Science and Technology Affiliated Hospital, Tangshan 063000, Hebei, China
  • Received:2016-06-13 Online:2017-01-10 Published:2017-01-10

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Abstract: Objective To establish a new accurate equation and to compare the accuracy with 19 kinds of known equations(5 clinical parameter equations and 14 ultrasonic parameter equations)for estimation of the birth weight of term fetus(FW). Methods A total of 224 term pregnant women with singleton between October 2015 and April 2016 in the North China University of Science and Technology Affiliated Hospital were included in the present study. They were divided into macrosomia group(FW<4 000 g, n=183)and non-macrosomia group(FW≥4 000 g, n=41). An ultrasound examination was performed 5 days before delivery. Clinical data and ultrasound data were collected. The data were analyzed with Pearson correlation analysis, multiple linear regression, analysis of variance, and LSD test. Results Three new equations were established: clinical parameter equation, ultrasonic parameter equation and joint parameter equation. Among them, the joint parameter equation showed the smallest absolute error in different groups, EFW(estimated FW)= 40.39×fundal height+84.60×AC+244.17×TCD+221.79×FSTT+141.98×LL+127.31×BPD-4 467.98. Among the 5 kinds of clinical parameter equations, Zhuo Jingru equation for the macrosomia group and the overall subjects, and Luo Laimin equation for the non-macrosomia group showed the smallest absolute error. Among the 14 kinds of ultrasound parameter equations, Hadlock FP(BPD, HC, AC, FL)for macrosomia group and the overall subjects, and Merz E(BPD, AC)for non-macrosomia group showed smallest absolute error. Conclusion The new established joint parameter equation can estimate FW more accurately.

Key words: Absolute error, Term, Regression equation, Fetal weight, Accuracy

CLC Number: 

  • R445.1
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