Kaj Sparle Christensen1, Eva Oernboel2, Doug Zatzick3, Joan Russo3. 1. Research Unit for General Practice, Department of Public Health, Aarhus University, Denmark. Electronic address: kasc@ph.au.dk. 2. Research Clinic for Functional Disorders and Psychosomatics, Aarhus University Hospital, Denmark. 3. Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA.
Abstract
OBJECTIVE: The Patient Health Questionnaire (PHQ-9) is widely used for screening of depression in acutely injured trauma survivors. Rasch analysis has been used to evaluate its measurement characteristics. This paper aims: 1) to assess the psychometric properties of the nine PHQ-9 items and 2) to determine the structural validity of using the total PHQ-9 score as a clinical outcome measure. METHODS: PHQ-9 data for 937 persons aged 18-60years admitted to 20 level 1 trauma centers in the United States were included. Good model fit indicates that all items contribute to a single underlying trait. RESULTS: Item 2 demonstrated misfit to the Rasch model, and six items showed disordered response categories. Ordered response categories were achieved for all nine items after modifying the original four-point scoring system into a three-point system. Person separation reliability was acceptable (0.80) for discriminating between groups of patients. Dimensionality testing supported combining the nine items into a total score. No significant differential item functioning was observed for sex and age group. CONCLUSION: Despite some minor problems with its measurement structure, the short nine-item version of the PHQ seems to be an economic and valid instrument for the screening of depression in adults admitted to level 1 trauma centers.
OBJECTIVE: The Patient Health Questionnaire (PHQ-9) is widely used for screening of depression in acutely injured trauma survivors. Rasch analysis has been used to evaluate its measurement characteristics. This paper aims: 1) to assess the psychometric properties of the nine PHQ-9 items and 2) to determine the structural validity of using the total PHQ-9 score as a clinical outcome measure. METHODS: PHQ-9 data for 937 persons aged 18-60years admitted to 20 level 1 trauma centers in the United States were included. Good model fit indicates that all items contribute to a single underlying trait. RESULTS: Item 2 demonstrated misfit to the Rasch model, and six items showed disordered response categories. Ordered response categories were achieved for all nine items after modifying the original four-point scoring system into a three-point system. Person separation reliability was acceptable (0.80) for discriminating between groups of patients. Dimensionality testing supported combining the nine items into a total score. No significant differential item functioning was observed for sex and age group. CONCLUSION: Despite some minor problems with its measurement structure, the short nine-item version of the PHQ seems to be an economic and valid instrument for the screening of depression in adults admitted to level 1 trauma centers.
Authors: Noelle E Carlozzi; Siera Goodnight; Anna L Kratz; Julie C Stout; Michael K McCormack; Jane S Paulsen; Nicholas R Boileau; David Cella; Rebecca E Ready Journal: J Huntingtons Dis Date: 2019
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Authors: Jonas Christian Schupp; Urs Alexander Fichtner; Björn Christian Frye; Katja Heyduck-Weides; Surinder S Birring; Wolfram Windisch; Carl-Peter Criée; Joachim Müller-Quernheim; Erik Farin Journal: PLoS One Date: 2018-10-04 Impact factor: 3.240