title: Risk factors for age-related macular degeneration: Pooled findings from three continents.
abstract: OBJECTIVE
  To assess the prevalence and potential risk factors for late age-related macular degeneration (AMD) in three racially similar populations from North America, Europe, and AUSTRALIA:
  
  
  METHODS
  Combined analysis of population-based eye disease prevalence data.
  
  
  METHODS
  There were 14,752 participants with gradable photographs from the Beaver Dam Eye Study (n = 4756), Rotterdam Study (n = 6411), and Blue Mountains Eye Study (n = 3585).
  
  
  METHODS
  AMD diagnosis was made from masked grading of stereo macular photographs. Final classification of AMD cases was agreed by consensus between study investigators.
  
  
  RESULTS
  AMD prevalence was strongly age related. Overall, AMD was present in 0.2% of the combined population aged 55 to 64 years, rising to 13% of the population older than 85 years. Prevalence of neovascular AMD (NV) increased from 0.17% among subjects aged 55 to 64 years to 5.8% for those older than 85 years. Prevalence of pure geographic atrophy (GA) increased from 0.04% to 4.2% for these age groups. There were no significant gender differences in the prevalence of NV or GA. Subjects in the Rotterdam population had a significantly lower age-adjusted and smoking-adjusted risk of NV than subjects in the Beaver Dam and Blue Mountains populations. Apart from age, tobacco smoking was the only risk factor consistently associated with any form of AMD in all sites separately and in pooled analyses over the three sites.
  
  
  CONCLUSIONS
  These combined data from racially similar communities across three continents provide strong and consistent evidence that tobacco smoking is the principal known preventable exposure associated with any form of AMD.
authors: National Centre for Epidemiology & Population Health, Australian National University, Canberra, Australia.
authors: W
authors: W
authors: Smith
authors: J
authors: J
authors: Assink
authors: R
authors: R
authors: Klein
authors: P
authors: P
authors: Mitchell
authors: C C
authors: CC
authors: Klaver
authors: B E
authors: BE
authors: Klein
authors: A
authors: A
authors: Hofman
authors: S
authors: S
authors: Jensen
authors: J J
authors: JJ
authors: Wang
authors: P T
authors: PT
authors: de Jong
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008268:Macular Degeneration / Q000145:classification / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D009426:Netherlands / Q000453:epidemiology; D009517:New South Wales / Q000453:epidemiology; D015995:Prevalence; D012307:Risk Factors; D017678:Sex Distribution; D012907:Smoking / Q000009:adverse effects; D014922:Wisconsin / Q000453:epidemiology