2.6.1. Primary outcomes

PTSD Symptom Severity. The PTSD Symptom Scale, Interview Version for DSM-5 (PSSI-5) [48], a 24-item clinician-administered interview, will be used for PTSD diagnosis and measure PTSD symptom severity. The PSSI-5 rates the frequency and severity of PTSD symptoms in the past 4 weeks on a 5-point Likert scale from 0 (not at all) to 4 (very much). The PSSI-5 has demonstrated excellent reliability and validity but takes less time than the gold standard mostly used [58], the Clinician-Administered PTSD Scale for DSM-5 (CAPS5).

The PTSD CheckList-DSM5 (PCL-5) [49], a 20-item self-report measurement, will be used for self-report PTSD symptoms. The Chinese versions of PSSI-5 and PCL-5 have both been validated [50,51].