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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: Pain. 2017 Aug;158(8):1586–1598. doi: 10.1097/j.pain.0000000000000961

Table 1.

Component loadings for treatment in CPCA modeling

Factors PC1 PC2
Loading P-value Loading P-value
Total brain volume 0.746 0,0000 0.611 0.0000
Sex 0.623 0,0000 −0.762 0.0000
Vehicle vs Sucrose −0.037 0.7005 −0.360 0.0001

CPCA factor loadings for Vehicle versus Sucrose model; two principal components (PC)s were extracted from the predicted solution, where PC1 reflected total brain volume and sex and PC2 reflected treatment; explained variance for PC1 and PC2 are 26.2%, 22.7% respectively, n = 52–57 per group. Significant loadings (Bonferroni P < 0.013) particular to treatment shown in bold.

CPCA, constrained principal component analysis.