title: Differential functioning of the Beck depression inventory in late-life patients: use of item response theory.
abstract: The present analyses examined age-related measurement bias in responses to items on the revised Beck Depression Inventory (BDI) in depressed late-life patients versus midlife patients. Item response theory (IRT) models were used to equate the scale and to differentiate true-group differences from bias in measurement in the 2 samples. Baseline BDI data (218 late life and 613 midlife) were used for the present analysis. IRT results indicated that late-life patients tended to report fewer cognitive symptoms, especially at low to average levels of depression. Conversely, they tended to report more somatic symptoms, especially at higher levels of depression. Adjusted cutoff scores in the late-life group are provided, and possible reasons for age-related differences in the performance of the BDI are discussed.
authors.affiliation: Department of Health and Community Systems, University of Pittsburgh, Pennsylvania 15261, USA. ykk@pitt.edu
authors.forename: Yookyung
authors.initials: Y
authors.lastname: Kim
authors.forename: Paul A
authors.initials: PA
authors.lastname: Pilkonis
authors.forename: Ellen
authors.initials: E
authors.lastname: Frank
authors.forename: Michael E
authors.initials: ME
authors.lastname: Thase
authors.forename: Charles F
authors.initials: CF
authors.lastname: Reynolds
mesh_terms: D000328:Adult; D000367:Age Factors; D000375:Aging / Q000502:physiology; D003865:Major Depressive Disorder / Q000175:diagnosis* / Q000523:psychology*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires