Factor structure and convergent validity of the Derriford Appearance Scale-24 using standard scoring versus treating 'not applicable' responses as missing data: a Scleroderma Patient-centered Intervention Network (SPIN) cohort study.

ABSTRACT:

Objective

Valid measures of appearance concern are needed in systemic sclerosis (SSc), a rare, disfiguring autoimmune disease. The Derriford Appearance Scale-24 (DAS-24) assesses appearance-related distress related to visible differences. There is uncertainty regarding its factor structure, possibly due to its scoring method.

Design

Cross-sectional survey.

Setting

Participants with SSc were recruited from 27 centres in Canada, the USA and the UK. Participants who self-identified as having visible differences were recruited from community and clinical settings in the UK.

Participants

Two samples were analysed (n=950 participants with SSc; n=1265 participants with visible differences).

Primary and secondary outcome measures

The DAS-24 factor structure was

SUBMITTER: Merz EL 

PROVIDER: S-EPMC5855329 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature