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The scatter plot of the raw data for the best-fit fractional polynomial regression model showing the estimated GA by CRL expressed in days and mm, respectively, for the first group of 322 subjects is shown in [Figure 1].
Keywords: Crown-rump length; dating; gestational age How to cite this URL: Oboro VO, Bello TO, Oyeniran AO.
The date of last normal menstrual period, GA at delivery, and the CRL from first trimester ultrasonography were obtained from the hospital records.
The ultrasound scans were performed by consultant radiologists or senior registrars in the Radiology Department of our institution with a Medison X6 and X8 machines (Medison, Seoul, South Korea).
The strength of our study derived from our ability to exclude pregnancies with complications that were likely to affect fetal size, such as congenital anomalies, intra-uterine growth restriction, or intra-uterine fetal death, were consistent with the criteria reported by Altman and Chitty.
This was made possible because data were collected retrospectively from an available clinical dataset after the pregnancies have completed their course.