Item Response Theory Analysis of Two Questionnaire Measures of Arthritis-Related Self-Efficacy Beliefs from Community-Based US Samples

Abstract EN

Using item response theory (IRT), we examined the Rheumatoid Arthritis Self-efficacy scale (RASE) collected from a People with Arthritis Can Exercise RCT (346 participants) and 2 subscales of the Arthritis Self-efficacy scale (ASE) collected from an Active Living Every Day (ALED) RCT (354 participants) to determine which one better identifies low arthritis self-efficacy in community-based adults with arthritis.

The item parameters were estimated in Multilog using the graded response model.

The 2 ASE subscales are adequately explained by one factor.

There was evidence for 2 locally dependent item pairs; two items from these pairs were removed when we reran the model.

The exploratory factor analysis results for RASE showed a multifactor solution which led to a 9-factor solution.

In order to perform IRT analysis, one item from each of the 9 subfactors was selected.

Both scales were effective at measuring a range of arthritis SE.