title: Age and gender variations in age-related macular degeneration prevalence in populations of European ancestry: a meta-analysis.
abstract: OBJECTIVE
  To obtain prevalence estimates of age-related macular degeneration (AMD; late, geographic atrophy, neovascular) by age and gender amongst populations of European ancestry taking into account study design and time trends.
  
  
  METHODS
  Systematic review of population-based studies published by September 2010 with quantitative estimates of geographic atrophy (GA), neovascular (NV), and late AMD prevalence. Studies were identified by a literature search of MEDLINE (from 1950), EMBASE (from 1980), and Web of Science (from 1980) databases.
  
  
  METHODS
  Data from 25 published studies (57 173 subjects: 455 with GA, 464 with NVAMD, and 1571 with late AMD).
  
  
  METHODS
  Bayesian meta-regression of the log odds of AMD with age, gender, and year of study allowing for differences in study design characteristics, to estimate prevalences of AMD (late, GA, NVAMD) along with 95% credible intervals (CrI).
  
  
  METHODS
  Log odds and prevalence of AMD.
  
  
  RESULTS
  There was considerable heterogeneity in prevalence rates between studies; for late AMD, 20% of the variability in prevalence rates was explained by differences in age and 50% by study characteristics. The prevalence of AMD increased exponentially with age (odds ratio [OR], 4.2 per decade; 95% CrI, 3.8-4.6), which did not differ by gender. There was some evidence to suggest higher risk of NVAMD in women compared with men (OR, 1.2; 95% CrI, 1.0-1.5). Compared with studies using fundus imaging and international classification systems, studies using fundus imaging with alternative classifications were more likely (OR, 2.7; 95% CrI, 1.1-2.8), and studies using alternative classifications without fundus imaging most likely to diagnose late AMD (OR, 2.9; 95% CrI, 1.3-7.8). There was no good evidence of trends in AMD prevalence over time. Estimated prevalence of late AMD is 1.4% (95% CrI, 1.0%-2.0%) at 70 years of age, rising to 5.6% (95% CrI, 3.9%-7.7%) at age 80 and 20% (95% CrI, 14%-27%) at age 90.
  
  
  CONCLUSIONS
  Studies using recognized classifications systems with fundus photography reported the lowest prevalences of AMD taking account of age and gender, and were stable over time, with a potentially higher risk of NVAMD for women. These prevalence estimates can be used to guide health service provision in populations of European ancestry.
authors.affiliation: Division of Population Health Sciences and Education, St. George's, University of London, London, UK.
authors.forename: Alicja R
authors.initials: AR
authors.lastname: Rudnicka
authors.forename: Zakariya
authors.initials: Z
authors.lastname: Jarrar
authors.forename: Richard
authors.initials: R
authors.lastname: Wormald
authors.forename: Derek G
authors.initials: DG
authors.lastname: Cook
authors.forename: Astrid
authors.initials: A
authors.lastname: Fletcher
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Owen
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D016208:Databases, Factual; D005260:Female; D006801:Humans; D008268:Macular Degeneration / Q000145:classification / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D015995:Prevalence; D012307:Risk Factors; D017678:Sex Distribution; D006113:United Kingdom / Q000453:epidemiology; D044465:White People / Q000706:statistics & numerical data*