Journal of Gerontology: MEDICAL SCIENCES Cite journal as: J Gerontol A Biol Sci Med Sci 2009. Vol. 64A, No. 2, 249–255 doi:10.1093/gerona/gln027
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[email protected]. Advance Access publication on February 4, 2009
Recent Hospitalization and the Risk of Hip Fracture Among Older Americans Fredric D. Wolinsky,1,2 Suzanne E. Bentler,2 Li Liu,2 Maksym Obrizan,2 Elizabeth A. Cook,2 Kara B. Wright,2 John F. Geweke,2 Elizabeth A. Chrischilles,2 Claire E. Pavlik,2 Robert L. Ohsfeldt,3 Michael P. Jones,2 Kelly K. Richardson,1,2 Gary E. Rosenthal,1,2 and Robert B. Wallace2 1The
Iowa City VA Medical Center, Iowa City. 2The University of Iowa, Iowa City. 3Texas A&M University Health Science Center, College Station, Texas. Background. We identified hip fracture risks in a prospective national study. Methods. Baseline (1993–1994) interview data were linked to Medicare claims for 1993–2005. Participants were 5,511 self-respondents aged 70 years and older and not in managed Medicare. ICD9-CM 820.xx (International Classification of Diseases, 9th Edition, Clinical Modification) codes identified hip fracture. Participants were censored at death or enrollment into managed Medicare. Static risk factors included sociodemographic, socioeconomic, place of residence, health behavior, disease history, and functional and cognitive status measures. A time-dependent marker reflecting postbaseline hospitalizations was included. Results. A total of 495 (8.9%) participants suffered a postbaseline hip fracture. In the static proportional hazards model, the greatest risks involved age (adjusted hazard ratios [AHRs] of 2.01, 2.82, and 4.91 for 75–79, 80–84, and ≥85 year age groups vs those aged 70–74 years; p values
