An item response theory analysis of an item pool for the recovering quality of life (ReQoL) measure.

ABSTRACT:

Purpose

ReQoL-10 and ReQoL-20 have been developed for use as outcome measures with individuals aged 16 and over, experiencing mental health difficulties. This paper reports modelling results from the item response theory (IRT) analyses that were used for item reduction.

Methods

From several stages of preparatory work including focus groups and a previous psychometric survey, a pool of items was developed. After confirming that the ReQoL item pool was sufficiently unidimensional for scoring, IRT model parameters were estimated using Samejima's Graded Response Model (GRM). All 39 mental health items were evaluated with respect to item fit and differential item function regarding age, gender, ethnicity, and diagnosis. Scales were evaluated regarding overall measurement precisio

SUBMITTER: Keetharuth AD 

PROVIDER: S-EPMC7847872 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature