title: Epidemiology and short-term outcomes of injured medicare patients.
abstract: OBJECTIVE
  To describe characteristics and short-term outcomes of Medicare patients hospitalized after injuries in 1999.
  
  
  METHODS
  Analysis of national population-based case series.
  
  
  METHODS
  Hospitalized Medicare patients.
  
  
  METHODS
  All fee-for-service Medicare patients aged 65 and older admitted for the first time in 1999 with principal injury diagnoses (International Classification of Diseases, Ninth Revision, codes 800-904, 910-929, 940-957, 959).
  
  
  METHODS
  Incidence rates, stratified by anatomic location (hip, other extremity, spine, head, chest, other), sex, and age group (65-74, 75-84, >or=85). For each category, Charlson comorbidity scores, Abbreviated Injury Scores, hospital length of stay, discharge disposition, hospital mortality, 30-day mortality, and readmissions within 30 days of discharge.
  
  
  RESULTS
  A total of 439,605 persons were admitted at least once (crude rate 1,654/100,000). Rates of hospitalization increased with age and were generally higher in women (except head injuries). Comorbidities were more common in men. Hip fractures constituted 46.6% of cases and other extremity injuries another 30.7%. Hospital mortality (3.7% overall) increased with age, was greater in men, and was highest in patients with head injuries. The proportion discharged to skilled nursing facilities (43.8% overall, range 10.0-61.9% by age/sex/anatomic category) also increased with age, was higher in women, and was highest in patients with hip fractures. Slightly more than one-tenth (12.3%) of patients were readmitted within 30 days. Thirty-day mortality was 2.0 times hospital mortality (range 1.2-3.4 by category).
  
  
  CONCLUSIONS
  Most injuries resulting in hospitalization for the Medicare population involve the extremities, but other injuries have higher mortality. Many injured patients are not discharged home but receive additional institutional care. Thirty-day survival is much lower than observed hospital survival. Further studies of injuries using Medicare data are warranted.
authors.affiliation: Center for Outcomes Research and Evaluation, Maine Medical Center, Portland, Maine 04102, USA. clarkd@mmc.org
authors.forename: David E
authors.initials: DE
authors.lastname: Clark
authors.forename: Michael A
authors.initials: MA
authors.lastname: DeLorenzo
authors.forename: F L
authors.initials: FL
authors.lastname: Lucas
authors.forename: David E
authors.initials: DE
authors.lastname: Wennberg
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D018588:Fee-for-Service Plans / Q000706:statistics & numerical data; D005260:Female; D005568:Forms and Records Control; D017052:Hospital Mortality; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D038801:International Classification of Diseases; D008297:Male; D006278:Medicare / Q000706:statistics & numerical data*; D010351:Patient Discharge; D015996:Survival Rate; D016896:Treatment Outcome; D014481:United States / Q000453:epidemiology; D014947:Wounds and Injuries / Q000453:epidemiology* / Q000401:mortality