This work was supported by a grant from the Korean Mental Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea (HM15C1058). Writing-review & editing: Joo Eon Park, Daeho Kim, Daeyoung Roh. Validation: Joo Eon Park, Daeho Kim, Daeyoung Roh, Jeong-Ho Chae. Supervision: Joo Eon Park, Daeho Kim, Jeong-Ho Chae. Resources: Young-Eun Jung, Daeyoung Roh, Daeho Kim, Joo Eon Park. Methodology: Won-Hyoung Kim, Joo Eon Park. Investigation: Young-Eun Jung, Daeyoung Roh, Daeho Kim, Joo Eon Park. Formal analysis: Won-Hyoung Kim, Joo Eon Park. All remaining authors have declared no conflicts of interest.Ĭonceptualization: Won-Hyoung Kim, Joo Eon Park. The datasets generated or analyzed during the study are available from the corresponding author on reasonable request.ĭaeho Kim, a contributing editor of the Psychiatry Investigation, was not involved in the editorial evaluation or decision to publish this article. Sensitivity, specificity, positive predictive value, negative predictive value, and overall efficiency were measured for each threshold score of K-PCL-5 and K-PCL-5-S. To measure the diagnostic accuracy of K-PCL-5, K-PCL-5-S, and IES-R for PTSD, the area under the ROC curves (AUCs), standard errors, and 95% confidence intervals (CI) were calculated. The optimal cutoff scores of the K-PCL-5-S and the best predicted current PTSD by SCID-5-RV were estimated by receiver operating characteristic curve (ROC) analysis. Exploratory factor analysis was performed using principal component analysis with varimax rotation to determine the factor structure of the K-PCL-5. Pearson correlation coefficients were used to evaluate the concurrent validity of K-PCL-5, K-PCL-5-S, BDI-II, BAI, IES-R, and STAI. Test-retest reliability was evaluated by the same interviewers who performed the two testing sessions within five days. Test-retest and inter-rater reliability were calculated using intraclass correlation coefficients. To measure the internal consistencies of K-PCL-5, Cronbach’s alpha coefficients were computed, and the item-total correlation coefficients of these scales were measured to confirm whether all items on these scales also exhibited internal consistency. The Korean versions of the BDI-II, BAI, IES-R, and STAI have previously been shown to exhibit excellent psychometric properties, and their internal consistency coefficients (Cronbach’s alpha) were reported to be 0.85, 0.90, 0.76, and 0.91, respectively.Īmong the PTSD, psychiatric control, and normal control groups, demographic variables and clinical characteristics were compared using analysis of variance (ANOVA) or χ 2 analyses, depending on the type of variables. The STAI, with 40 self-check questions, was developed to assess the severity of state and trait anxiety. IES-R, a 22-item self-reporting questionnaire composed of eight questions for intrusion, eight for avoidance, and six for hyperarousal, was used to assess the severity of PTSD symptoms. BDI-II, a 21-item self-administered questionnaire, was designed to evaluate the severity of depression and the BAI with 21 items to evaluate the severity of anxiety. The Beck Depression Inventory-II (BDI-II), Beck Anxiety Inventory (BAI), Impact of Event Scale-Revised (IES-R), and Spielberger State Trait Anxiety Inventory (STAI) were also used to assess the correlations with the scores of the KPCL-5 and K-PCL-5-S. All the healthy controls demonstrated a lack of history of psychiatric disorders in SCID-5-RV. The healthy control group included 88 randomly selected individuals who visited the institutions for regular health screening. The diagnoses of the subjects in the psychiatric control group included major depressive disorder (n=44), panic disorder (n=6), and generalized anxiety disorder (n=24). Interviewer training consisted of lectures on the SCID-5-RV and related questionnaires, observation of an evaluation performed by an experienced psychiatrist, and group evaluation of videos of patients with PTSD. PTSD and other psychiatric disorders were diagnosed using SCID-5-RV, which is a semi-structured interview guide for making DSM-5 diagnoses including depression, anxiety, and PTSD. The 274 participants comprised 71 with PTSD, 74 with mood disorder or anxiety disorder as a psychiatric control group, and 99 as a healthy control group. A total of 274 participants were recruited from eight medical institutions throughout Korea, from February 2016 to March 2017. We used data from the study on the reliability and validity of the Korean version of CAPS-5.
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