Box (median, 25th and 75th percentiles) and whisker (5th and 95th percentiles) plot showing group differences in MitoSOX median fluorescence intensity (MFI) between healthy nondepressed adults in gray plots [HA, n = 11 (6 males/5 females)] and otherwise healthy young adults with major depressive disorder in orange plots [MDD, n = 14 (4 males/10 females)] for total T cell (CD3+; A), T-helper (CD4+; B), and T-cytotoxic (CD8+; C) cells. Data were analyzed using the Mann–Whitney U test.