Item response theory analysis of cognitive tests in people with dementia: a systematic review

Sarah McGrory, Jason Doherty, Elizabeth J Austin, John M Starr, Susan D Shenkin

Research output: Contribution to journalArticlepeer-review

Abstract

Performance on psychometric tests is key to diagnosis and monitoring treatment of dementia. Results are often reported as a total score, but there is additional information in individual items of tests which vary in their difficulty and discriminatory value. Item difficulty refers to an ability level at which the probability of responding correctly is 50%. Discrimination is an index of how well an item can differentiate between patients of varying levels of severity. Item response theory (IRT) analysis can use this information to examine and refine measures of cognitive functioning. This systematic review aimed to identify all published literature which had applied IRT to instruments assessing global cognitive function in people with dementia.
Original languageEnglish
Number of pages15
JournalBMC Psychiatry
Volume14
Issue number47
DOIs
Publication statusPublished - 19 Feb 2014

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