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Journal of Obesity & Metabolic Syndrome

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Korean J Obes 2011; 20(2): 65-74

Published online June 1, 2011

Copyright © Korean Society for the Study of Obesity.

The Comparison of the Cut-Off Definition for Diagnosing Overweight and Obesity Among Middle and High School Students in Seoul

Yun A Shin*, Yun Jung Shin(1), Jin Kyoung Park(2), Joanne Park(3)

Department of Prescription & Rehabilitation of Exercise, College of Sports Science, Dankook University, Department of Sports Health Management, Sangmyung University(1), Department of Maternal and Child Health Center, Soonchunhyang University(2), Coca-Cola Korea Youth Foundation(3)

Abstract

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Background: There is still much debate on which standard cutoff value should be used for diagnosing adolescent obesity although various cutoff values have been used for assessing overweight and obesity in adolescents. This study compares the prevalence of overweight and obesity in adolescents according to the different cutoff values.
Methods: Subjects included 6,571 students from middle and high schools in Korea during 2008 until 2010. Degree of obesity, body mass index and percent body fat were measured. The sensitivity and specificity of the cutoff values of International Obesity Task Force, IOTF, the Working Group for Obesity in China, WGOC, body mass index, and 85th and 95th percentile of body fat were compared
according to the degree of obesity, gender, and age.
Results: The prevalence of overweight and obesity differed by gender and age. The IOTF cutoff value was the most sensitive in screening for the prevalence of overweight in boys. WGOC cutoff value was the most sensitive in screening for the prevalence of obesity in both boys and girls. It was also the most sensitive cutoff value for screening overweight girls.
Conclusion: The prevalence of obesity varied depending on the different cutoff values. The WGOC cutoff value showed to be the most sensitive and specific in screening for obesity.

Keywords: Obesity cutoff, Obesity degree, IOTF cutoff, WGOC cutoff, Adolescent

Figures

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Fig. 1. Comparison of age-cutoff prevalence of overweight in boys. IOTF, international obesity task force; WGOC, the working group for obesity in china; Obesity degree, fixed values of 20% for overweight and 30% for obese; BMIth percentile, gender and age-specific 85th and 95th percentiles of body mass index; FATth percentile, gender and age-specific 85th and 95th percentiles of percent body fat.
Fig. 2. Comparison of age-cutoff prevalence of obesity in boys. IOTF, international obesity task force; WGOC, the working group for obesity in china; Obesity degree, fixed values of 20% for overweight and 30% for obese; BMIth percentile, gender and age-specific 85th and 95th percentiles of body mass index; FATth percentile, gender and age-specific 85th and 95th percentiles of percent body fat.
Fig. 3. Comparison of age-cutoff prevalence of overweight in girls. IOTF, international obesity task force; WGOC, the working group for obesity in china; Obesity degree, fixed values of 20% for overweight and 30% for obese; BMIth percentile, gender and age-specific 85th and 95th percentiles of body mass index; FATth percentile, gender and age-specific 85th and 95th percentiles of percent body fat.
Fig. 4. Comparison of age-cutoff prevalence of obesity in girls. IOTF, international obesity task force; WGOC, the working group for obesity in china; Obesity degree, fixed values of 20% for overweight and 30% for obese; BMIth percentile, gender and age-specific 85th and 95th percentiles of body mass index; FATth percentile, gender and age-specific 85th and 95th percentiles of percent body fat.

Tables

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Height, weight, body mass index, and percent body fat in adolescents 12~18 years old



Prevalence for percent body fat and body mass index used to define overweight and obesity, by gender and age



Sensitivity, specificity and for the obesity degree cutoff according to different definitions of overweight, by gender



Sensitivity, specificity and for the obesity degree cutoff according to different definitions of obesity, by gender


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