MMP2 and post-traumatic stress disorder: Median MMP-2 levels were markedly elevated in the Past PTSD (≤5 y) group (21.66 ng/mL, IQR: 16.90–23.80) compared to the Past PTSD (>5 y) group (5.34 ng/mL, IQR: 2.81–12.55) and the controls (1.75 ng/mL, IQR: 1.37–2.11) across all ages.