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. 2013 Dec 7;13:151. doi: 10.1186/1471-2288-13-151

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Copyright © 2013 Ohuma et al.; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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INTERGROWTH-21^stcrown-rump length measurements in relation to gestational age with fitted centiles (Approach 2). Full title: Crown-rump length (CRL) measurements in relation to gestational age (grey small hollow circles) with 3^rd, 50^th and 97^th fitted centiles (Panel A). Brown small crosses in panels B and C represents the INTERGROWTH-21^st project data for CRL from 9⁺⁰ to 13⁺⁶ weeks gestational age of the fitted equation of the mean and SD from panel A. Panel C shows the model fit relating GA and CRL (Approach 2).