Differential item functioning in the Unified Dyskinesia Rating Scale (UDysRS).

ABSTRACT:

Objective

Test if differential item functioning due to gender, age, race/ethnicity, or education impacts Unified Dyskinesia Rating Scale scores.

Background

Testing rating scales for differential item functioning is a core validation step. If differential item functioning exists, interpretation of item scores must consider secondary influences on dyskinesia ratings.

Methods

Using Unified Dyskinesia Rating Scale translation databases (N = 3,132), we tested uniform and nonuniform differential item functioning. We required confirmation by two independent methods and considered differential item functioning pertinent if McFadden pseudo R² magnitude statistics exceeded negligible ratings.

Results

No age, race/ethnicity, or education nonuniform differential

SUBMITTER: Luo S 

PROVIDER: S-EPMC5570621 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature