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. 2020 Sep 3;15(9):e0238604. doi: 10.1371/journal.pone.0238604

Fig 2. Principal component analysis of the metabolomic dataset of the four groups.

Fig 2

Percentage on the axes represent the contribution rate of the first (PC1) and second (PC2) principal components. PC1 and PC2 had contribution ratios of 35.4% and 24.5%, respectively, and were sufficient to distinguish the four groups. Ellipses are graphical representations of groups without any statistical support. NAir, newborn, room air; NO2, newborn hyperoxia; AAir, adult room air; AO2, adult, hyperoxia; PC, principal component.