Patel Tapan A, Robison Morgan, Cougle Jesse R
Florida State University, Tallahassee, USA.
Assessment. 2024 Dec 23:10731911241306370. doi: 10.1177/10731911241306370.
This study examined the item- and scale-level functioning of the Social Appearance Anxiety Scale (SAAS) as well as differential functioning by gender using an item response theory (IRT) analysis. SAAS data collected from 840 college students were analyzed. A graded response model was used to analyze the 16 items comprising the SAAS. The measure was found to be unidimensional in its factor structure, and every item demonstrated high to very high ability to differentiate respondents varying in levels of the underlying trait (i.e., appearance concerns). In addition, we found evidence of differential item functioning (DIF) by gender for four items, corresponding to small effect sizes. Two of these items were related to internal experiences of appearance concerns (e.g., nervousness and discomfort when a flaw is noticed by others) that were more likely to be endorsed by women, and two of the items were related to external evaluative experiences related to appearance (e.g., missing opportunities and life being more difficult) that were more likely to be endorsed by men. Overall, the IRT and DIF results suggest that the SAAS effectively identifies appearance concerns among individuals with low to very high appearance concerns.
本研究采用项目反应理论（IRT）分析，考察了社交外表焦虑量表（SAAS）在项目和量表层面的功能，以及按性别划分的差异性功能。对从840名大学生收集的SAAS数据进行了分析。使用分级反应模型分析了构成SAAS的16个项目。结果发现，该量表在因子结构上是单维的，每个项目都表现出高到非常高的区分潜在特质（即外表担忧）水平不同的受访者的能力。此外，我们发现四个项目存在按性别划分的项目功能差异（DIF），效应量较小。其中两个项目与外表担忧的内在体验有关（例如，当他人注意到瑕疵时感到紧张和不适），女性更有可能认可；另外两个项目与外表相关的外部评价体验有关（例如，错过机会和生活更艰难），男性更有可能认可。总体而言，IRT和DIF结果表明，SAAS能够有效识别外表担忧程度从低到非常高的个体中的外表担忧情况。
