Gender-, age-, and race/ethnicity-based differential item functioning analysis of the movement disorder society-sponsored revision of the Unified Parkinson's disease rating scale.

ABSTRACT:

Objective

Assess MDS-UPDRS items for gender-, age-, and race/ethnicity-based differential item functioning.

Background

Assessing differential item functioning is a core rating scale validation step. For the MDS-UPDRS, differential item functioning occurs if item-score probability among people with similar levels of parkinsonism differ according to selected covariates (gender, age, race/ethnicity). If the magnitude of differential item functioning is clinically relevant, item-score interpretation must consider influences by these covariates. Differential item functioning can be nonuniform (covariate variably influences an item-score across different levels of parkinsonism) or uniform (covariate influences an item-score consistently over all levels of parkinsonism).

Methods

SUBMITTER: Goetz CG 

PROVIDER: S-EPMC5289884 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature