Nina Obbarius1, Felix Fischer2, Alexander Obbarius2, Sandra Nolte3, Gregor Liegl2, Matthias Rose4. 1. Charité -Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Psychosomatic Medicine, Center for Internal Medicine and Dermatology, Charitplatzé 1, Berlin 10117, Germany. Electronic address: nina.obbarius@charite.de. 2. Charité -Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Psychosomatic Medicine, Center for Internal Medicine and Dermatology, Charitplatzé 1, Berlin 10117, Germany. 3. Charité -Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Psychosomatic Medicine, Center for Internal Medicine and Dermatology, Charitplatzé 1, Berlin 10117, Germany; Population Health Strategic Research Centre, School of Health and Social Development, Deakin University, 221 Burwood Highway, Burwood, VIC, Victoria 3125, Australia. 4. Charité -Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Psychosomatic Medicine, Center for Internal Medicine and Dermatology, Charitplatzé 1, Berlin 10117, Germany; Department of Quantitative Health Sciences, Outcomes Measurement Science, University of Massachusetts Medical School, 368 Plantation Street, The Albert Sherman Center, Worcester, MA 01605, USA.
Abstract
OBJECTIVES: To develop the first item bank to measure stress resilience (SR) in clinical populations. STUDY DESIGN AND SETTING: Qualitative item development resulted in an initial pool of 131 items covering a broad theoretical SR concept. These items were tested in n = 521 patients at a psychosomatic outpatient clinic. Exploratory and confirmatory factor analysis, as well as other state-of-the-art item analyses and item response theory were used for item evaluation and calibration of the final item bank. RESULTS: Of the initial item pool of 131 items, we excluded 64 items (54 factor loading <0.5, four residual correlations >0.3, two nondiscriminative item response curves, and four differential item functioning). The final set of 67 items indicated sufficient model fit in confirmatory factor analysis and item response theory analyses. In addition, a 10-item short form with high measurement precision (SE ≤ 0.32 in a theta range between -1.8 and +1.5) was derived. Both the SR item bank and the SR short form were highly correlated with an existing static legacy tool (Connor-Davidson Resilience Scale). CONCLUSION: The final SR item bank and 10-item short form showed good psychometric properties. When further validated, they will be ready to be used within a framework of computer-adaptive tests for a comprehensive assessment of the stress construct.
OBJECTIVES: To develop the first item bank to measure stress resilience (SR) in clinical populations. STUDY DESIGN AND SETTING: Qualitative item development resulted in an initial pool of 131 items covering a broad theoretical SR concept. These items were tested in n = 521 patients at a psychosomatic outpatient clinic. Exploratory and confirmatory factor analysis, as well as other state-of-the-art item analyses and item response theory were used for item evaluation and calibration of the final item bank. RESULTS: Of the initial item pool of 131 items, we excluded 64 items (54 factor loading <0.5, four residual correlations >0.3, two nondiscriminative item response curves, and four differential item functioning). The final set of 67 items indicated sufficient model fit in confirmatory factor analysis and item response theory analyses. In addition, a 10-item short form with high measurement precision (SE ≤ 0.32 in a theta range between -1.8 and +1.5) was derived. Both the SR item bank and the SR short form were highly correlated with an existing static legacy tool (Connor-Davidson Resilience Scale). CONCLUSION: The final SR item bank and 10-item short form showed good psychometric properties. When further validated, they will be ready to be used within a framework of computer-adaptive tests for a comprehensive assessment of the stress construct.
Authors: Suky Martinez; Jermaine D Jones; Laura Brandt; Denise Hien; Aimee N C Campbell; Sarai Batchelder; Sandra D Comer Journal: Drug Alcohol Depend Date: 2021-02-16 Impact factor: 4.492