Multivariable evaluation of term birth weight: a comparison between ultrasound biometry and symphysis-fundal height

Abstract Objective: To derive a birth weight predictive equation and to compare its diagnostic value with that of ultrasound. Methods: A longitudinal observational cohort study, including singleton pregnancies at term, was performed at St. Orsola-Malpighi Hospital, University of Bologna (Italy). A b...

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Bibliographic Details
Published in:The journal of maternal-fetal & neonatal medicine 2014-09, Vol.27 (13), p.1328-1332
Main Authors: Curti, Alessandra, Zanello, Margherita, De Maggio, Irene, Moro, Elisa, Simonazzi, Giuliana, Rizzo, Nicola, Farina, Antonio
Format: Article
Language:English
Subjects:
Adult
Algorithms
Anthropometry
Birth Weight
Cohort Studies
Female
General linear model
Humans
Linear Models
Male
multivariable birth weight prediction
Predictive Value of Tests
Pregnancy
symphysis-fundal height
term of pregnancy
Ultrasonography, Prenatal
ultrasound
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Summary:Abstract Objective: To derive a birth weight predictive equation and to compare its diagnostic value with that of ultrasound. Methods: A longitudinal observational cohort study, including singleton pregnancies at term, was performed at St. Orsola-Malpighi Hospital, University of Bologna (Italy). A birth weight prediction formula, including symphysis-fundal height (SFH), BMI, maternal abdominal circumference (mAC) and parity was derived from a general linear model (GLM) (retrospective study). Moreover, on a new series of patients, the fetal weight was estimated by using both GLM and ultrasound using Hadlock formula (prospective study). The residual analysis and the intraclass correlation coefficient (ICC) were used to test the accuracy of methods in predicting birth weight. Results: Between January and November 2012, 1034 patients were included in the retrospective study and 44 in the prospective one. The following GLM was derived: estimated birth weight (g) = 1485.61 + (SFH (cm) × 23.37) + (11.62 (cm) × mAC) + [BMI × (−6.81)] + (parity (0 = nulliparous, 1 = multiparous) × 72.25). When prospectively applied, the GLM and ultrasound provided a percentage of prediction within ±10% of the actual weight of 73% and 84%, respectively. Ultrasound estimation, as opposite of GLM one, was significantly associated with neonatal weight (R2 = 0.388, F = 26.607, p value
ISSN:1476-7058
1476-4954
DOI:10.3109/14767058.2013.858241