title: Development of an Expanded Measure of Physical Functioning for Older Persons in Epidemiologic Research.
abstract: We scaled a measure of physical functioning to a population-based normative sample by extending self-reported basic and instrumental activities of daily living with items from the Medical Outcomes Study 12-Item Short Form Survey. We used item response theory to place items administered to a sample of older elective surgery patients on a common metric linked to the Patient Reported Outcomes Measurement Information System (PROMIS) normative sample using published data. The summary measure for physical functioning was internally consistent (Cronbach's α = .83), reliable across a broad range of functioning, and was moderately correlated with walking speed (r = .52) and energy expenditure (r = .40). Demonstrating predictive criterion validity, less impaired scores were associated with lower risk of discharge to a rehabilitation facility (odds ratio = .38, 95% confidence interval [CI] [0.22, 0.66]) and shorter hospital stays (incidence rate ratio [IRR] = 0.87, 95% CI [0.79, 0.97]). Our approach may facilitate direct comparison of physical functioning measures across existing and future studies using a common, population-based metric, when overlapping items with the National Institutes of Health (NIH) PROMIS item bank are present.
authors: Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA; Center on Aging and Health, Johns Hopkins University, Baltimore, MD, USA agross14@jhu.edu.
authors: Alden L
authors: AL
authors: Gross
authors: Departments of Psychiatry and Human Behavior and Neurology, Warren Alpert Medical School, Brown University, Providence, RI, USA.
authors: Richard N
authors: RN
authors: Jones
authors: Aging Brain Center, Institute for Aging Research, Hebrew SeniorLife, Boston, MA, USA Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors: Sharon K
authors: SK
authors: Inouye
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D004185:Disability Evaluation; D016021:Epidemiologic Studies; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D015203:Reproducibility of Results; D013514:Surgical Procedures, Operative / Q000534:rehabilitation*; D011795:Surveys and Questionnaires / Q000592:standards*
keywords: ADL; IADL; functioning; item response theory; older adults
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