title: Incidence of exudative age-related macular degeneration among elderly Americans.
abstract: OBJECTIVE
  To estimate the 3-year incidence of exudative age-related macular degeneration (AMD) and its treatment by laser photocoagulation in elderly Americans.
  
  
  METHODS
  Population-based cohort study using insurance claims data.
  
  
  METHODS
  A random 5% sample of Medicare beneficiaries, age 65 and older.
  
  
  METHODS
  Incidence of exudative AMD and of laser photocoagulation for this condition was assessed based on four categories of ascertainment criteria that included procedure and diagnosis codes associated with exudative AMD, choroidal neovascularization, and its treatment.
  
  
  METHODS
  Incidence of AMD and of associated laser photocoagulation.
  
  
  RESULTS
  Overall, the 3-year incidence of exudative AMD is estimated to be between 9.4 per 1000 and 11.4 per 1000 Americans age 65 and older (depending on ascertainment criteria), based on those diagnosed and treated by ophthalmologists for the condition. These estimates bracket the measured incidence of exudative AMD in the Beaver Dam Eye Study and lie within its 95% confidence interval. The 3-year incidence of exudative AMD with attendant laser photocoagulation was 2.3 per 1000. Women were found to have a slightly higher incidence of AMD than men using all ascertainment criteria (P < 0.001), and white Americans were found to have a fivefold-to-sixfold higher ascertainment criteria than black Americans (P < 0.001).
  
  
  CONCLUSIONS
  The reported incidence of exudative AMD identified in the population of Medicare beneficiaries suggests that measurements on incidence for this condition derived from the Beaver Dam Eye Study can be generalized to the U.S. population.
authors.affiliation: Wilmer Ophthalmological Institute, Johns Hopkins University, Baltimore, Maryland, USA. jjavitt@healthdirections.net
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Javitt
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Zhou
authors.forename: Maureen G
authors.initials: MG
authors.lastname: Maguire
authors.forename: Stuart L
authors.initials: SL
authors.lastname: Fine
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Willke
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D005260:Female; D006801:Humans; D015994:Incidence; D017075:Laser Coagulation / Q000706:statistics & numerical data; D008268:Macular Degeneration / Q000453:epidemiology* / Q000601:surgery; D008297:Male; D016344:Medicare Part A / Q000706:statistics & numerical data; D008875:Middle Aged; D011897:Random Allocation; D012307:Risk Factors; D017678:Sex Distribution; D014481:United States / Q000453:epidemiology