title: Obesity among children residing in Mexico City and its impact on lung function: a comparison with Mexican-Americans.
abstract: BACKGROUND
  The objective of the study was to describe the prevalence of obesity among Mexican children and its impact on ventilatory lung function.
  
  
  METHODS
  We studied cross-sectionally 6784 students between 8 and 20 years of age attending schools located <2 km away from ten air pollution monitors located throughout metropolitan Mexico City. The comparison group was made up of 1924 Mexican-Americans of the same age, studied during the NHANES-III examination, which included information on spirometry and body mass index (BMI).
  
  
  RESULTS
  Of all our subjects, 9.7% had a BMI >95(th) percentile of CDC growth charts (compared to 15.1% in Mexican-Americans) and 6.6% fulfilled the obesity criteria of the International Obesity Task Force (vs. 12.2%). Obesity was related to male gender, asthma and passive smoking. At the same height and gender, lung function was higher in Mexicans than in Mexican-Americans, perhaps due to altitude. In children 8-11 years of age, lung function increased in heavier subjects but, in older children and youths, function reached a plateau and decreased among children with highest BMI (inverted U pattern, seen in adults).
  
  
  CONCLUSIONS
  Obesity is higher in Mexican-American children and youths than in Mexicans. Spirometric function is affected adversely by obesity, especially in young people.
authors.affiliation: Instituto Nacional de Enfermedades Respiratorias, Mexico, D.F., Mexico. perezpad@servidor.unam.mx
authors.forename: Rogelio
authors.initials: R
authors.lastname: Pérez-Padilla
authors.forename: Rosalba
authors.initials: R
authors.lastname: Rojas
authors.forename: Victor
authors.initials: V
authors.lastname: Torres
authors.forename: Victor
authors.initials: V
authors.lastname: Borja-Aburto
authors.forename: Gustavo
authors.initials: G
authors.lastname: Olaiz
authors.lastname: The Empece Working Group
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001249:Asthma / Q000150:complications / Q000453:epidemiology; D015992:Body Mass Index; D002648:Child; D005260:Female; D006801:Humans; D007198:Indians, North American; D008297:Male; D009765:Obesity / Q000453:epidemiology* / Q000209:etiology; D012737:Sex Factors; D012907:Smoking / Q000009:adverse effects / Q000453:epidemiology; D013147:Spirometry / Q000379:methods