Assessment of English-French differential item functioning of the Satisfaction with Appearance Scale (SWAP) in systemic sclerosis

作者：Jewett Lisa R; Kwakkenbos Linda^*; Hudson Marie; Baron Murray; Thombs Brett D

来源：Body Image, 2017, 22: 97-102.

DOI：10.1016/j.bodyim.2017.06.005

• Satisfaction with Appearance Scale
• Systemic sclerosis
• Body image
• Measurement
• Differential item functioning

The Satisfaction with Appearance Scale (SWAP) has been used to assess body image distress among people with the rare and disfiguring disease systemic sclerosis (SSc); however, it has not been validated across different languages groups. The objective was to examine differential item functioning of the SWAP among 856 Canadian English- or French-speaking SSc patients. Confirmatory factor analysis was used to evaluate the SWAP two-factor structure (Dissatisfaction with Appearance and Social Discomfort). The Multiple-Indicator Multiple-Cause model was utilized to assess differential item functioning. Results revealed that the established two-factor model of the SWAP demonstrated relatively good fit. Statistically significant, but small-magnitude differential item functioning was found for three SWAP items based on language; however, the cumulative effect on SWAP scores was negligible. Findings provided empirical evidence that SWAP scores from Canadian English- and French-speaking patients can be compared and pooled without concern that measurement differences may substantially influence results.

• 出版日期2017-9
• 单位McGill; 河北医科大学