Figure 2. Pairwise Pearson correlations between metabolites significantly associated with either gait speed or grip strength in cross sectional analysis. Metabolites are ordered according to correlation coefficient. Correlations between each pair of metabolites are displayed in the cells of the heatmap. Cells are color coded with colors ranging from blue to red to depict correlations ranging from -1 to 1. RI=retention index. * indicates compounds with Metabolomics Standards Initiative confidence level 2.