title: Area-level poverty is associated with greater risk of ambulatory-care-sensitive hospitalizations in older breast cancer survivors.
abstract: OBJECTIVE
  To estimate the frequency of ambulatory care-sensitive hospitalizations (ACSHs) and to compare the risk of ACSH in breast cancer survivors living in high-poverty with that of those in low-poverty areas.
  
  
  METHODS
  Prospective, multilevel study.
  
  
  METHODS
  National, population-based 1991 to 1999 National Cancer Institute Surveillance, Epidemiology, and End Results Program data linked with Medicare claims data throughout the United States.
  
  
  METHODS
  Breast cancer survivors aged 66 and older.
  
  
  METHODS
  ACSH was classified according to diagnosis at hospitalization. The percentage of the population living below the U.S. federal poverty line was calculated at the census-tract level. Potential confounders included demographic characteristics, comorbidity, tumor and treatment factors, and availability of medical care.
  
  
  RESULTS
  Of 47,643 women, 13.3% had at least one ACSH. Women who lived in high-poverty census tracts (>or=30% poverty rate) were 1.5 times (95% confidence interval (CI)=1.34-1.72) as likely to have at least one ACSH after diagnosis as women who lived in low-poverty census tracts (<10% poverty rate). After adjusting for most confounders, results remained unchanged. After adjustment for comorbidity, the hazard ratio (HR) was reduced to 1.34 (95% CI=1.18-1.52), but adjusting for all variables did not further reduce the risk of ACSH associated with poverty rate beyond adjustment for comorbidity (HR=1.37, 95% CI=1.19-1.58).
  
  
  CONCLUSIONS
  Elderly breast cancer survivors who lived in high-poverty census tracts may be at increased risk of reduced posttreatment follow-up care, preventive care, or symptom management as a result of not having adequate, timely, and high-quality ambulatory primary care as suggested by ACSH.
authors.affiliation: Department of Medicine, Division of Health Bhavioral Research, Barnes-Jewish Hospital, Washington University School of Medicine, St Louis, Missouri 63108, USA. mschootm@im.wustl.edu
authors.forename: Mario
authors.initials: M
authors.lastname: Schootman
authors.forename: Donna B
authors.initials: DB
authors.lastname: Jeffe
authors.forename: Min
authors.initials: M
authors.lastname: Lian
authors.forename: Anjali D
authors.initials: AD
authors.lastname: Deshpande
authors.forename: William E
authors.initials: WE
authors.lastname: Gillanders
authors.forename: Rebecca
authors.initials: R
authors.lastname: Aft
authors.forename: Walton
authors.initials: W
authors.lastname: Sumner
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000553:Ambulatory Care / Q000706:statistics & numerical data*; D001943:Breast Neoplasms / Q000628:therapy*; D003266:Continuity of Patient Care / Q000706:statistics & numerical data*; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D011203:Poverty; D011446:Prospective Studies; D012307:Risk Factors; D017741:Survivors