title: The Spanish version of the Quick Inventory of Depressive Symptomatology-Self-Report (QIDS-SR16): a psychometric analysis in a clinical sample.
abstract: BACKGROUND
  Psychometrically robust and easy-to-administer scales for depressive symptoms are necessary for research and clinical assessment. This is a psychometric study of the Spanish version of the Quick Inventory of Depressive Symptomatology-Self-Report (QIDS-SR16) in a clinical sample.
  
  
  METHODS
  One-hundred and seventy-three patients (65% women) with a psychiatric disorder including depressive symptoms were recruited. Such symptoms were assessed by means of the QIDS-SR16 and two interviewer-rated instruments: the 17-item Hamilton Depression Rating Scale (HDRS17) and the Clinical Global Impression-Severity (CGI-S) scale. Self-rated measures of health-related quality of life, subjective happiness and perceived social support were also obtained. Dimensionality, internal consistency, construct validity, criterion validity, and responsiveness to change of the QIDS-SR16 were examined.
  
  
  RESULTS
  Exploratory and confirmatory factor analyses replicated the original one-factor structure. The Spanish version of the QIDS-SR16 showed good to excellent internal consistency (α=0.88), convergent validity [HDRS17 (r=0.77), CGI-S (r=0.78)], and divergent validity [EuroQol-5D Visual Analogue Scale (r=-0.78), Subjective Happiness Scale (r=-0.72)]. The QIDS-SR16 was excellent in discriminating clinically significant from non-significant depressive symptomatology (area under ROC curve=0.93). It also showed a high sensitivity to treatment-related changes: patients with greater clinical improvement showed a greater decrease in QIDS-SR16 scores (p<0.001).
  
  
  CONCLUSIONS
  The study was conducted in a single center, which may limit the generalizability of the findings.
  
  
  CONCLUSIONS
  The Spanish version of the QIDS-SR16 retains the soundness of metric characteristics of the original version which makes the scale an invaluable instrument to assess depressive symptoms.
authors.affiliation: Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau, Institut d׳Investigació Biomèdica Sant Pau (IIB Sant Pau), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Sant Antoni Maria Claret 167, 08025 Barcelona, Spain. Electronic address: jtrujols@santpau.cat.
authors.forename: Joan
authors.initials: J
authors.lastname: Trujols
authors.affiliation: Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau, Institut d׳Investigació Biomèdica Sant Pau (IIB Sant Pau), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Sant Antoni Maria Claret 167, 08025 Barcelona, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: de Diego-Adeliño
authors.affiliation: Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau, Institut d׳Investigació Biomèdica Sant Pau (IIB Sant Pau), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Sant Antoni Maria Claret 167, 08025 Barcelona, Spain.
authors.forename: Albert
authors.initials: A
authors.lastname: Feliu-Soler
authors.affiliation: DeustoPsych - Unidad de Investigación, Desarrollo e Innovación en Psicología y Salud, Universidad de Deusto, Bilbao, Spain.
authors.forename: Ioseba
authors.initials: I
authors.lastname: Iraurgi
authors.affiliation: Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau, Institut d׳Investigació Biomèdica Sant Pau (IIB Sant Pau), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Sant Antoni Maria Claret 167, 08025 Barcelona, Spain.
authors.forename: Dolors
authors.initials: D
authors.lastname: Puigdemont
authors.affiliation: Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau, Institut d׳Investigació Biomèdica Sant Pau (IIB Sant Pau), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Sant Antoni Maria Claret 167, 08025 Barcelona, Spain; Departament de Psiquiatria i Medicina Legal, Facultat de Medicina, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain.
authors.forename: Enric
authors.initials: E
authors.lastname: Alvarez
authors.affiliation: Departament de Psiquiatria i Medicina Legal, Facultat de Medicina, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain; Institut de Neuropsiquiatria i Addiccions, Parc de Salut Mar, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Barcelona, Spain.
authors.forename: Víctor
authors.initials: V
authors.lastname: Pérez
authors.affiliation: Servei de Psiquiatria, Hospital de la Santa Creu i Sant Pau, Institut d׳Investigació Biomèdica Sant Pau (IIB Sant Pau), Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Sant Antoni Maria Claret 167, 08025 Barcelona, Spain.
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Portella
mesh_terms: D000328:Adult; D000368:Aged; D003863:Depression / Q000175:diagnosis*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010555:Personality Inventory; D011446:Prospective Studies; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics; D011788:Quality of Life; D012372:ROC Curve; D057566:Self Report; D013030:Spain
keywords: Affective disorders; Assessment; Depressive symptoms; Psychometric study; Self-report