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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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Crown-rump length measurements in relation to gestational age with fitted centiles (Approach 3). Full title: Crown-rump length (CRL) measurements in relation to gestational age (GA) with fitted 3^rd, 50^th and 97^th centiles (Panel A). Panel B shows the relation between GA and CRL after interchanging the axes and fitting new models to the three sets of coordinates. Panel C shows the model obtained by simply taking the average of 2 SDs. An equation for the SD relating GA to CRL was then obtained by regressing this SD (of GA) on CRL and estimating outer centiles by combining the model for SD with that for the median (Approach 3).