title: The psychometric properties of the Quick Inventory of Depressive Symptomatology-Self-Report (QIDS-SR) and the Patient Health Questionnaire-9 (PHQ-9) in depressed inpatients in China.
abstract: This study examined the psychometric properties of the 16-item Quick Inventory of Depressive Symptomatology-Self-Report (QIDS-SR) and Patient Health Questionnaire-9 (PHQ-9). The study sample comprised 297 depressed inpatients. The severity of depressive symptoms was assessed with the Hamilton Rating Scale for Depression, the QIDS-SR and the PHQ-9 in all subjects at baseline and a random sample of 50 subjects two weeks later. The internal consistency, convergent validity, factor structure and sensitivity to change of these scales were assessed. Internal consistency (Cronbach's alpha) of the PHQ-9 and QIDS-SR were 0.88 and 0.83, respectively at baseline and 0.91 and 0.87, respectively at exit. Item to total score correlations were higher for the PHQ-9 than those for the QIDS-SR at baseline and exit. Three domains at baseline and two at study exit of the QIDS-SR had a correlation less than 0.65; while only two items at baseline and no item at exit were less than 0.65 for the PHQ-9. Both the PHQ-9 and the QIDS-SR showed uni-dimensional measurement properties at baseline; the two instruments were less sensitive than the HAMD to detect changes of depressive symptoms suggesting low convergent validity. The QIDS-SR and the PHQ-9 have similar and acceptable psychometric properties in most domains as tested in depressed inpatients.
authors.affiliation: Mood Disorders Center, Beijing Anding Hospital, Capital Medical University, Beijing, China; China Clinical Research Center for Mental Disorders, China; Center of Depression, Beijing Institute for Brain Disorders, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Department of Psychiatry, Harbin First Specialist Hospital, Heilongjiang province, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.affiliation: Mood Disorders Center, Beijing Anding Hospital, Capital Medical University, Beijing, China; China Clinical Research Center for Mental Disorders, China; Center of Depression, Beijing Institute for Brain Disorders, China.
authors.forename: Teng-Fei
authors.initials: TF
authors.lastname: Tian
authors.affiliation: Mood Disorders Center, Beijing Anding Hospital, Capital Medical University, Beijing, China; China Clinical Research Center for Mental Disorders, China; Center of Depression, Beijing Institute for Brain Disorders, China. Electronic address: gangwangdoc@gmail.com.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.affiliation: Mood Disorders Center, Beijing Anding Hospital, Capital Medical University, Beijing, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Hu
authors.affiliation: Department of Psychiatry, Chinese University of Hong Kong, Hong Kong SAR, China.
authors.forename: Helen F K
authors.initials: HF
authors.lastname: Chiu
authors.affiliation: The University of Notre Dame Australia/Marian Centre, Perth, Australia; School of Psychiatry & Clinical Neurosciences, University of Western Australia, Perth, Australia.
authors.forename: Gabor S
authors.initials: GS
authors.lastname: Ungvari
authors.affiliation: Department of Psychiatry, University of Michigan Medical School, Ann Arbor, MI, USA; Veterans Administration Ann Arbor Center for Clinical Management Research, Ann Arbor, MI, USA.
authors.forename: Amy M
authors.initials: AM
authors.lastname: Kilbourne
authors.affiliation: Unit of Psychiatry, Faculty of Health Sciences, University of Macau, Macao SAR, China. Electronic address: xyutly@gmail.com.
authors.forename: Yu-Tao
authors.initials: YT
authors.lastname: Xiang
mesh_terms: D000328:Adult; D002681:China; D003863:Depression / Q000175:diagnosis*; D059026:Diagnostic Self Evaluation; D005260:Female; D006801:Humans; D007297:Inpatients; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics
keywords: China; Depressive symptoms; PHQ-9; QIDS-SR