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. 2016 Jun 17;6:28029. doi: 10.1038/srep28029

Table 2. Overall results of polynomial regressions.

Order R2 F-test P-value
1st 0.797 86.477 <0.001
2nd 0.855 62.032 <0.001
3rd 0.856 39.504 <0.001

The strengths of correlations between models and response variables are represented as R2 values. F-test simultaneously accesses multiple coefficients of regression and compares the fits of different linear models. The P-values stand for the statistical significance of corresponding F-test.