title: Comorbidity and mortality following hip fracture: a population-based cohort study.
abstract: OBJECTIVE
  Identifying predictors for mortality following hip fracture is essential in order to improve survival, especially among the elderly. We compared mortality after hip fracture to controls without hip fracture, and assessed the impact of comorbidity on mortality following hip fracture in a population-based cohort study.
  
  
  METHODS
  The health care databases in Western Denmark (1.4 million inhabitants) were used to identify all persons > or = 40 years of age with first-time hospitalization for hip fracture between 1/1/1998 and 1/31/2003. Five population controls without hip fracture were matched to hip fracture patients on age and gender. Prior hospitalization for selected comorbidities among hip fracture subjects was assessed from hospital discharge registries. Cox regression analysis was used to compute crude and adjusted relative risks and 95% confidence intervals for 30-day, 90-day, and 1-year mortality associated with hip fracture, and with prior hospital history of selected comorbidities.
  
  
  RESULTS
  The cohort was followed for an average of 22 months. Females comprised 71% of the cohort and 90% was aged 65 years or older. Compared to persons without hip fracture, persons with hip fracture had from 2 to >3-fold higher risk of death at 1 year. History of congestive heart failure (CHF), chronic obstructive pulmonary disease (COPD), dementia, tumor, and malignancy increased adjusted 1-year mortality from 50% to 3-fold among persons with hip fracture.
  
  
  CONCLUSIONS
  Hip fracture increased 1-year mortality more than 3-fold compared with mortality without hip fracture. Among hip fracture subjects, the presence of selected comorbidities further increased the risk of mortality after hip fracture.
authors.affiliation: School of Public Health, University of Medicine and Dentistry of New Jersey (UMDNJ), Newark, New Jersey, USA. deluiscy@umdnj.edu
authors.forename: Cynthia
authors.initials: C
authors.lastname: de Luise
authors.forename: Michael
authors.initials: M
authors.lastname: Brimacombe
authors.forename: Lars
authors.initials: L
authors.lastname: Pedersen
authors.forename: Henrik T
authors.initials: HT
authors.lastname: Sørensen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015897:Comorbidity; D005260:Female; D006620:Hip Fractures / Q000401:mortality / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis; D012307:Risk Factors; D015996:Survival Rate