Evaluation of the Adult Strabismus-20 (AS-20) questionnaire using Rasch analysis.

ABSTRACT:

Purpose

To further refine the Adult Strabismus 20 (AS-20) health-related quality of life (HRQOL) questionnaire using Rasch analysis.

Methods

Rasch analysis was performed independently on the original AS-20 using the following steps: dimensionality, response ordering, local dependence, infit and outfit analyses, differential item functioning, subject targeting, and confirmatory dimensionality.

Results

Two subscales were present in each of the original AS-20 subscales, for a total of 4 subscales, which were labeled "self-perception," "interaction," "reading function," and "general function." Response ordering was appropriate for 3 of the subscales but required reduction to 4 response options for the fourth subscale. No notable local dependence was found for any subscale

SUBMITTER: Leske DA 

PROVIDER: S-EPMC4686183 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature