title: Application of the Chinese Version of the Whiteley Index-7 for Detecting DSM-5 Somatic Symptom and Related Disorders.
abstract: The Whiteley Index-7 (WI-7) is frequently used for evaluating patients with suspected hypochondriasis. However, information about its use on somatic symptom and related disorders in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) is still lacking. This study investigated the psychometric properties of the Mandarin Chinese version of the WI-7 and its application to evaluation of somatic symptom and related disorders.
  
  
  
  Participants completed the WI-7 and received diagnostic interview based on both Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) and DSM-5 criteria. Exploratory factor analysis was performed, and the test-retest reliability and the internal consistency of the WI-7 were assessed. Receiver Operating Characteristic curves were established, and the area under the curve was calculated to determine the cutoff point to distinguish DSM-IV somatoform disorders and DSM-5 somatic symptom and related disorders, respectively.
  
  
  
  A total of 471 subjects were recruited for this study. The exploratory factor analysis of the WI-7 identified a single factor. The internal consistency and test-retest reliability of the WI-7 were 0.829 and 0.836, respectively. The area under Receiver Operating Characteristic curve using WI-7 to distinguish DSM-5 somatic symptom and related disorders is 0.660, higher than that when applying to distinguish DSM-IV somatoform disorders. The sensitivity and specificity at an optimal cutoff point of 0/1 are 0.645 and 0.675, respectively.
  
  
  
  The Mandarin Chinese version of the WI-7 is a potentially useful tool to detect individuals with DSM-5 somatic symptom and related disorders.
authors.affiliation: Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Chao-Ying
authors.initials: CY
authors.lastname: Tu
authors.affiliation: Department of Psychiatry, College of Medicine, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan.
authors.forename: Shih-Cheng
authors.initials: SC
authors.lastname: Liao
authors.affiliation: Department of Psychiatry, Yun-Lin Branch, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Chao-Yu
authors.initials: CY
authors.lastname: Liu
authors.affiliation: Department of Psychiatry, Yun-Lin Branch, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Tzu-Ting
authors.initials: TT
authors.lastname: Chen
authors.affiliation: Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan; Institute of Health Policy and Management, College of Public Health, National Taiwan University, Taipei, Taiwan.
authors.forename: I-Ming
authors.initials: IM
authors.lastname: Chen
authors.affiliation: Department of Psychiatry, Yun-Lin Branch, National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Kuan-Fu
authors.initials: KF
authors.lastname: Lin
authors.affiliation: Department of Psychiatry, College of Medicine, National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan; Department of Psychiatry, Yun-Lin Branch, National Taiwan University Hospital, Taipei, Taiwan; Graduate Institute of Clinical Medicine, National Taiwan, University, Taipei, Taiwan.
authors.forename: Wei-Lieh
authors.initials: WL
authors.lastname: Huang
mesh_terms: D000328:Adult; D001007:Anxiety / Q000523:psychology; D001008:Anxiety Disorders / Q000523:psychology; D019540:Area Under Curve; D003863:Depression / Q000523:psychology; D003865:Major Depressive Disorder / Q000523:psychology; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D006998:Hypochondriasis / Q000175:diagnosis / Q000523:psychology; D008297:Male; D000071896:Medically Unexplained Symptoms; D008875:Middle Aged; D011594:Psychometrics; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013001:Somatoform Disorders / Q000175:diagnosis* / Q000523:psychology; D011795:Surveys and Questionnaires; D014177:Translations
keywords: Whiteley Index-7; hypochondriasis; somatic symptom and related disorders; somatoform disorders