Rasch analysis suggested three unidimensional domains for Affiliate Stigma Scale: additional psychometric evaluation

doi:10.1016/j.jclinepi.2015.01.018

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Title:	Rasch analysis suggested three unidimensional domains for Affiliate Stigma Scale: additional psychometric evaluation
Authors:	Chang, Chih-Cheng Su, Jian-An Tsai, Ching-Shu Yen, Cheng-Fang Liu, Jiun-Horng Lin, Chung-Ying
Contributors:	老人服務事業管理系
Keywords:	Affiliate stigma Caregiver Classical test theory Family Rasch analysis Severe mental illness
Date:	2015-06
Issue Date:	2016-04-19 19:03:00 (UTC+8)
Publisher:	Elsevier Science Inc
Abstract:	Objectives: To examine the psychometrics of the Affiliate Stigma Scale using rigorous psychometric analysis: classical test theory (CTT) (traditional) and Rasch analysis (modern). Differential item functioning (DIF) items were also tested using Rasch analysis.Study Design and Setting: Caregivers of relatives with mental illness (n = 453; mean age: 53.29 +/- 13.50 years) were recruited from southern Taiwan. Each participant filled out four questionnaires: Affiliate Stigma Scale, Rosenberg Self-Esteem Scale, Beck Anxiety Inventory, and one background information sheet.Results: CTT analyses showed that the Affiliate Stigma Scale had satisfactory internal consistency (alpha = 0.85-0.94) and concurrent validity (Rosenberg Self-Esteem Scale: r = -0.52 to -0.46; Beck Anxiety Inventory: r = 0.27-0.34). Rasch analyses supported the unidimensionality of three domains in the Affiliate Stigma Scale and indicated four DIF items (affect domain: 1; cognitive domain: 3) across gender.Conclusion: Our findings, based on rigorous statistical analysis, verified the psychometrics of the Affiliate Stigma Scale and reported its DIF items. We conclude that the three domains of the Affiliate Stigma Scale can be separately used and are suitable for measuring the affiliate stigma of caregivers of relatives with mental illness. (C) 2015 Elsevier Inc. All rights reserved.
Relation:	Journal of Clinical Epidemiology, v.68 n.6, pp.674-683
Appears in Collections:	[Dept. of Senior Service and Health Management] Periodical Articles

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