J Korean Med Sci.  2015 Feb;30(2):162-166. 10.3346/jkms.2015.30.2.162.

Diagnostic Performance of Body Mass Index Using the Western Pacific Regional Office of World Health Organization Reference Standards for Body Fat Percentage

Affiliations
  • 1Department of Family Medicine, Hallym University College of Medicine, Chuncheon, Korea. fmjjcho@naver.com
  • 2Sejong Samsung Med Clinic, Kangbuk Samsung Hospital, Sejong, Korea.

Abstract

Associations between body mass index (BMI), body fat percentage (BF%), and health risks differ between Asian and European populations. BMI is commonly used to diagnose obesity; however, its accuracy in detecting adiposity in Koreans is unknown. The present cross-sectional study aimed at assessing the accuracy of BMI in determining BF%-defined obesity in 6,017 subjects (age 20-69 yr, 43.6% men) from the 2009 Korean National Health and Nutrition Examination Survey. We assessed the diagnostic performance of BMI using the Western Pacific Regional Office of World Health Organization reference standard for BF%-defined obesity by sex and age and identified the optimal BMI cut-off for BF%-defined obesity using receiver operating characteristic curve analysis. BMI-defined obesity (> or =25 kg/m2) was observed in 38.7% of men and 28.1% of women, with a high specificity (89%, men; 84%, women) but poor sensitivity (56%, men; 72% women) for BF%-defined obesity (25.2%, men; 31.1%, women). The optimal BMI cut-off (24.2 kg/m2) had 78% sensitivity and 71% specificity. BMI demonstrated limited diagnostic accuracy for adiposity in Korea. There was a -1.3 kg/m2 difference in optimal BMI cut-offs between Korea and America, smaller than the 5-unit difference between the Western Pacific Regional Office and global World Health Organization obesity criteria.

Keyword

Adiposity; Body Composition; Body Mass Index; Obesity

MeSH Terms

Adipose Tissue/*physiology
Adiposity/*physiology
Adult
Aged
*Body Mass Index
Cross-Sectional Studies
Female
Humans
Male
Middle Aged
Nutrition Surveys
Obesity/*diagnosis
ROC Curve
Reference Standards
Republic of Korea
Young Adult

Figure

  • Fig. 1 Receiver operating characteristic (ROC) curves for body mass index (BMI) to detect body fat percentage (BF%)-defined obesity for all subjects and by sex. AUC, area under the curve; BMI, body mass index.


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