Figure 1: A) Two-dimensional scores plot of human urine samples of DOL 8 calculated using the first two principal components of the PCA. The cluster circled at the lower right represents urine samples of the three ELBW infants suffering from suspected renal injury. The stars indicate the centroids of the two clusters discussed in the text, and the line joining the centroids represents the Mahalanobis distance discussed in the text. B) The loadings plot corresponding to the scores plot in Figure 1A. The solid ovals encircle groups of resonance frequency buckets that belong to the same metabolite and are labeled according to the identity of the metabolite.