title: Geographic variations of the International Diabetes Federation and the National Cholesterol Education Program-Adult Treatment Panel III definitions of the metabolic syndrome in nondiabetic subjects.
abstract: OBJECTIVE
  We have carried out international comparisons of the metabolic syndrome using the International Diabetes Federation (IDF) and National Cholesterol Education Program-Adult Treatment Panel III (ATP III) definitions. This analysis could help to discern the applicability of these definitions across populations.
  
  
  METHODS
  Nondiabetic subjects aged 35-64 years were eligible for analysis in population-based studies from San Antonio (Mexican Americans and non-Hispanic whites, n = 2,473), Mexico City (n = 1,990), Spain (n = 2,540), and Peru (n = 346). Kappa statistics examined the agreement between metabolic syndrome definitions.
  
  
  RESULTS
  Because of the lower cutoff points for elevated waist circumference, the IDF definition of the metabolic syndrome generated greater prevalence estimates than the ATP III definition. Prevalence difference between definitions was more significant in Mexican-origin and Peruvian men than in Europid men from San Antonio and Spain because the IDF definition required ethnic group-specific cutoff points for elevated waist circumference. ATP III and IDF definitions disagreed in the classification of 13-29% of men and 3-7% of women. In men, agreement between these definitions was 0.54 in Peru, 0.43 in Mexico City, 0.62 in San Antonio Mexican Americans, 0.69 in San Antonio non-Hispanic whites, and 0.64 in Spain. In women, agreement between definitions was 0.87, 0.89, 0.86, 0.87, and 0.93, respectively.
  
  
  CONCLUSIONS
  The IDF definition of the metabolic syndrome generates greater prevalence estimates than the ATP III definition. Agreement between ATP III and IDF definitions was lower for men than for women in all populations and was relatively poor in men from Mexico City.
authors.affiliation: Division of Clinical Epidemiology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78284-7873, USA. lorenzo@uthscsa.edu
authors.forename: Carlos
authors.initials: C
authors.lastname: Lorenzo
authors.forename: Manuel
authors.initials: M
authors.lastname: Serrano-Ríos
authors.forename: María T
authors.initials: MT
authors.lastname: Martínez-Larrad
authors.forename: José L
authors.initials: JL
authors.lastname: González-Sánchez
authors.forename: Segundo
authors.initials: S
authors.lastname: Seclén
authors.forename: Arturo
authors.initials: A
authors.lastname: Villena
authors.forename: Clicerio
authors.initials: C
authors.lastname: Gonzalez-Villalpando
authors.forename: Ken
authors.initials: K
authors.lastname: Williams
authors.forename: Steven M
authors.initials: SM
authors.lastname: Haffner
mesh_terms: D000328:Adult; D005260:Female; D006306:Health Surveys; D006801:Humans; D038622:Internationality; D008297:Male; D024821:Metabolic Syndrome / Q000145:classification* / Q000453:epidemiology; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D010568:Peru / Q000453:epidemiology; D015995:Prevalence; D013030:Spain / Q000453:epidemiology; D013781:Texas / Q000453:epidemiology; D014837:Voluntary Health Agencies