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. 2023 Sep 21;49(3):584–592. doi: 10.1038/s41386-023-01736-8

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Fig. 3 — A There was no significant correlation between quinolinic acid (QUIN) and age in controls (p = 0.664). B In major depressive disorder (MDD) there was a strong positive correlation between QUIN and age (r_s = 0.575 p < 0.001). C There was no correlation between age and kynurenic acid (KYNA) in controls or (D) in MDD. Males are represented by the outlined shapes.