Department of Psychiatry, Chi Mei Medical Center, 901 Zhonghua Rd., Yongkang Dist., Tainan City 710, Taiwan; Health Service and Population Research Department, Institute of Psychiatry, King's College London, De Crespigny Park, Denmark Hill, London SE5 8AF, United Kingdom; Department of Senior Citizen Service Management, College of Recreation and Health Management, Chia Nan University of Pharmacy and Science, No. 60, Sec. 1, Erren Rd., Rende Dist., Tainan City 71710, Taiwan.
Department of Psychiatry, Chang Gung Memorial Hospital, No. 6, West Section, Chia-Pu Rd, Pu-Zih City, Chiayi County 61344, Taiwan; Graduate Institute of Clinical Medical Sciences, Chang Gung University, No. 259, Wen-hua 1st Rd., Gui-shan District, Taoyuan City 33302, Taiwan; Department of Nursing, Chang Gung University of Science and Technology, No. 2, West Section, Chia-Pu Rd, Pu-Zih City, Chiayi County 61344, Taiwan.
J Clin Epidemiol. 2015 Jun;68(6):674-83. doi: 10.1016/j.jclinepi.2015.01.018. Epub 2015 Feb 2.
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.
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.
CTT analyses showed that the Affiliate Stigma Scale had satisfactory internal consistency (α = 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.
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.
使用严谨的心理计量学分析（经典测试理论（CTT）（传统）和 Rasch 分析（现代））来检验附属耻辱量表的心理计量学特性。还使用 Rasch 分析测试了具有差异项目功能（DIF）的项目。
从台湾南部招募了患有精神疾病的亲属的照顾者（n=453；平均年龄：53.29±13.50 岁）。每位参与者填写了四份问卷：附属耻辱量表、罗森伯格自尊量表、贝克焦虑量表和一份背景信息表。
CTT 分析表明，附属耻辱量表具有令人满意的内部一致性（α=0.85-0.94）和同时效度（罗森伯格自尊量表：r=-0.52 至-0.46；贝克焦虑量表：r=0.27-0.34）。Rasch 分析支持附属耻辱量表三个领域的单维性，并指出了四个跨性别 DIF 项目（情感领域：1；认知领域：3）。
基于严格的统计分析，我们的研究结果验证了附属耻辱量表的心理计量学特性，并报告了其 DIF 项目。我们得出结论，附属耻辱量表的三个领域可以分别使用，适用于衡量有精神疾病亲属的照顾者的附属耻辱感。
