In the Past PTSD ≤ 5 y group, two significant correlations are observed: UCHL1 with LIP (ρ = −0.36, p = 0.042) and UCHL1 with DIV (ρ =0.45, p = 0.009), which indicate that higher UCHL1 levels are linked to reduced anhedonia but increased diurnal symptom variation in recent PTSD. Here, UCHL1 is linked to post-traumatic stress disorder.