title: Utilization of blood transfusion among older adults in the United States.
abstract: BACKGROUND
  While there have been epidemiologic studies of blood donors, the characteristics of individuals who receive transfusions have not been well described for the US population.
  
  
  METHODS
  Subjects were from the nationally representative Health and Retirement Study whose data were linked to Medicare files from 1991 through 2007 (n = 16,377). A cohort study was conducted to assess the frequency of transfusion in older Americans over time and to describe the characteristics of blood recipients.
  
  
  RESULTS
  Thirty-one percent (95% confidence interval [CI], 30%-33%) of older Americans received at least one transfusion within a 10-year period and 5.8% (95% CI, 5.4%-6.2%) experienced repeated transfusion-related visits within 30 days. The mean number of transfusion-related visits was 2.3 over a 10-year period (95% CI, 2.2-2.4). Older Americans who lived in the South were most likely to receive a transfusion (34%), independent of demographic and health-related factors, while those who lived in the western United States were the least likely (26%). Predictors of transfusion included smoking, low body mass index, and a history of cancer, diabetes mellitus, end-stage renal disease, and heart disease. African-Americans and Mexican-Americans had greater rates of blood utilization than other races and other Hispanics (respectively). There were also differences in transfusion utilization by education, marital status, religion, and alcohol use.
  
  
  CONCLUSIONS
  Transfusion is common in older Americans. Regional variations in blood use are not explained by patient characteristics alone.
authors.affiliation: Department of Internal Medicine and Institute of Gerontology, University of Michigan, Ann Arbor, Michigan 48109-0429, USA. maryroge@umich.edu
authors.forename: Mary A M
authors.initials: MA
authors.lastname: Rogers
authors.forename: Neil
authors.initials: N
authors.lastname: Blumberg
authors.forename: Joanna M
authors.initials: JM
authors.lastname: Heal
authors.forename: Kenneth M
authors.initials: KM
authors.lastname: Langa
mesh_terms: D001741:Black or African American; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D001803:Blood Transfusion / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D014481:United States; D044465:White People