Recent Hospitalization and the Risk of Hip Fracture Among Older Americans

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