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. 2013 Mar 28;11:86. doi: 10.1186/1741-7015-11-86

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Copyright © 2013 Wang 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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Principal component analysis (PCA) score plots of rats in the low-calcium group (LCG) and normal-calcium group (NCG). (A-C) Week 2, n = 48 (for two components, R2Y = 45.0%, Q2 = 24.1%); week 4, n = 32 (for three components R2Y = 54.6%, Q2 = 27.6%) and week 9, n = 16 (for three components R2Y = 58.3%, Q2 = 32.1%). The R2Y value represents the goodness of fit of the model, and the Q2 value represents the predictability of the models. LCG rats are indicated by black squares and NCG rats by red triangles. Each data point represents one subject. Comp, component. t[1], component 1; t[2], component 2.