Turkish UCLA PTSD-RI-5: Validation and the Role of Symptom Severity in Functional Impairment.

PTSD-RI-5-TR showed good internal consistency and test-retest reliability (acceptable for Category C).

PTSD diagnoses were associated with significantly higher scores.

ROC analysis yielded an AUC = 0.909, sensitivity = 86.4%, specificity = 84.1% with an optimal cutoff score of 49.5.

In symptom cluster models, negative mood/cognition (D) most strongly predicted peer (OR = 1.205) and developmental impairment (OR = 1.155); avoidance (C) predicted home impairment (OR = 1.250); arousal/reactivity (E) predicted home (OR = 1.144) and school impairment (OR = 1.131); intrusion (B) showed no independent effect.