Williams Monnica T, Turkheimer Eric, Schmidt Karen M, Oltmanns Thomas F
Department of Psychology, University of Virginia, Charlottesville 22904, USA.
Assessment. 2005 Jun;12(2):174-85. doi: 10.1177/1073191105275620.
The authors report differential item functioning (DIF) between Black and White participants completing the 60-item Padua Inventory (PI) for obsessive-compulsive disorder (OCD). The authors use an Internet-generated sample that included 105 Blacks, 67 Hispanics, 582 Whites, and 136 additional participants reporting an OCD diagnosis. Factor analysis replicated prior work indicating the PI consists of four factors: contamination fears, checking behaviors, impaired control over thoughts, and fear of losing control over impulses. On the contamination subscale, nonclinical Black and Hispanic mean scores were as high as the OCD group. Comparing Blacks to Whites, the authors applied an item response theory, DIF-graded response model to each factor and found significant DIF on eight items, with biased items in each factor. Results suggest that extraneous factors contribute to racial differences on scores. Cultural practices and fear of being negatively stereotyped may contribute to item bias.
作者报告了完成60项强迫症帕多瓦量表（PI）的黑人和白人参与者之间的项目功能差异（DIF）。作者使用了一个通过互联网生成的样本，其中包括105名黑人、67名西班牙裔、582名白人以及另外136名报告患有强迫症诊断的参与者。因素分析重复了先前的研究结果，表明PI由四个因素组成：污染恐惧、检查行为、对思想的控制受损以及对冲动失去控制的恐惧。在污染子量表上，非临床黑人及西班牙裔的平均得分与强迫症组一样高。将黑人与白人进行比较时，作者对每个因素应用了项目反应理论的DIF分级反应模型，发现有八项指标存在显著的DIF，且每个因素中都有偏向性项目。结果表明，外部因素导致了得分上的种族差异。文化习俗以及对被负面刻板印象的恐惧可能导致项目偏差。
