title: Metabolically obese normal weight and phenotypically obese metabolically normal youths: the CASPIAN Study.
abstract: OBJECTIVE
  The objectives of this study were to estimate the prevalence and distribution of cardiovascular risk factors and the metabolic syndrome in children with generalized, central, or combined types of obesity and to possibly discover if a phenotypically obese metabolically normal and a metabolically obese normal weight phenotype could be identified in children and adolescents.
  
  
  METHODS
  This cross-sectional study is the baseline survey of a national longitudinal study. SUBJECT/SETTING: Overall 4,811 nationally representative children, aged 6 to 18 years, were recruited from the community through randomly selected schools within six provinces in Iran. In addition to physical examination, fasting glucose and lipid profile were assessed.
  
  
  METHODS
  Obesity type was considered the independent variable, cardiovascular risk factors and the metabolic syndrome were dependent variables. Prevalence of risk factors in different types of obesity was compared by multivariate analysis of variance and post-hoc tests. Logistic regression analysis was used to examine the associations between obesity type and the metabolic syndrome.
  
  
  RESULTS
  Varying with age and sex groups, 6% to 9% of children were categorized into the isolated central obesity group, 7.5% to 11% into the isolated generalized obesity, and 14% to 16.5% into the combined type group. The prevalence of dyslipidemia, high blood pressure, and metabolic syndrome was higher in those children with combined obesity than in those with the other two types of obesity, as well as in the central than in the generalized obesity groups. Phenotypically obese metabolically normal subjects were more prevalent in the generalized obesity group. The likelihood of metabolic syndrome was highest in those with combined obesity (odds ratio 3.7, 95% confidence interval 3.1 to 4), and lowest in generalized obesity group (odds ratio 2.1, 95% confidence interval 1.8 to 2.5).
  
  
  CONCLUSIONS
  This study complements recent research about the adverse health hazards of abdominal obesity in children. The finding of metabolically obese normal weight children suggests that additional investigation for cardiovascular risk factors may be warranted in normal-weight children with an ethnic predisposition to chronic diseases.
authors.affiliation: Preventive Pediatric Cardiology Department, Isfahan Cardiovascular Research Centre, Isfahan University of Medical Sciences, Isfahan, Iran. Kelishadi@med.mui.ac.ir
authors.forename: Roya
authors.initials: R
authors.lastname: Kelishadi
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Cook
authors.forename: Mohammad Esmaeil
authors.initials: ME
authors.lastname: Motlagh
authors.forename: Mohammad Mehdi
authors.initials: MM
authors.lastname: Gouya
authors.forename: Gelayol
authors.initials: G
authors.lastname: Ardalan
authors.forename: Molouk
authors.initials: M
authors.lastname: Motaghian
authors.forename: Reza
authors.initials: R
authors.lastname: Majdzadeh
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Ramezani
mesh_terms: D050153:Abdominal Fat / Q000378:metabolism; D000293:Adolescent; D000367:Age Factors; D000704:Analysis of Variance; D015992:Body Mass Index; D002318:Cardiovascular Diseases / Q000453:epidemiology* / Q000209:etiology / Q000378:metabolism; D002648:Child; D016001:Confidence Intervals; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D006949:Hyperlipidemias / Q000150:complications / Q000453:epidemiology; D006973:Hypertension / Q000150:complications / Q000453:epidemiology; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D024821:Metabolic Syndrome / Q000453:epidemiology* / Q000209:etiology / Q000378:metabolism; D009765:Obesity / Q000145:classification / Q000150:complications* / Q000378:metabolism*; D016017:Odds Ratio; D010641:Phenotype; D015995:Prevalence; D012307:Risk Factors; D012737:Sex Factors; D013851:Thinness / Q000378:metabolism*