|Title||Harmonizing Measures of Cognitive Performance Across International Surveys of Aging Using Item Response Theory.|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||Chan, KS, Gross, AL, Pezzin, LE, Brandt, J, Kasper, JD|
|Journal||J Aging Health|
|Date Published||2015 Dec|
|Keywords||Aged, Aged, 80 and over, Aging, Cognition, Female, Humans, Internationality, Longitudinal Studies, Male, Psychological Theory, Reproducibility of Results, Surveys and Questionnaires, United Kingdom, United States|
OBJECTIVE: To harmonize measures of cognitive performance using item response theory (IRT) across two international aging studies.
METHOD: Data for persons ≥65 years from the Health and Retirement Study (HRS, N = 9,471) and the English Longitudinal Study of Aging (ELSA, N = 5,444). Cognitive performance measures varied (HRS fielded 25, ELSA 13); 9 were in common. Measurement precision was examined for IRT scores based on (a) common items, (b) common items adjusted for differential item functioning (DIF), and (c) DIF-adjusted all items.
RESULTS: Three common items (day of date, immediate word recall, and delayed word recall) demonstrated DIF by survey. Adding survey-specific items improved precision but mainly for HRS respondents at lower cognitive levels.
DISCUSSION: IRT offers a feasible strategy for harmonizing cognitive performance measures across other surveys and for other multi-item constructs of interest in studies of aging. Practical implications depend on sample distribution and the difficulty mix of in-common and survey-specific items.
|User Guide Notes|
|Endnote Keywords|| |
ELSA_/item response theory/cognitive performance/Public Policy/Cognitive ability/Aging/cross-national comparison
|Endnote ID|| |
|Alternate Journal||J Aging Health|
|PubMed Central ID||PMC4834843|
|Grant List||P50 AG005146 / AG / NIA NIH HHS / United States |
R21 AG032502 / AG / NIA NIH HHS / United States
AG032502 / AG / NIA NIH HHS / United States