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ORIGINAL RESEARCH COMMUNICATIONS |
1 From the Division of Epidemiology and Public Health, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan (W-HP, W-TY, and C-JY); the Division of Nutritional Sciences, Institute of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan (W-HP); the Graduate Institute of Epidemiology, College of Public Health, National Taiwan University, Taipei, Taiwan (W-HP, C-JY, and W-CL); the National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, MD (KMF); and the Division of Health Policy, National Health Research Institute, Taipei, Taiwan (H-YC).
Background: Recommendations based on scanty data have been made to lower the body mass index (BMI; in kg/m2) cutoff for obesity in Asians.
Objective: The goal was to compare relations between BMI and metabolic comorbidity among Asians and US whites and blacks.
Methods: We compared the prevalence rate, sensitivity, specificity, predictive values, and impact fraction of comorbidities at each BMI level and the BMI-comorbidity relations across ethnic groups by using data from the third National Health and Nutrition Examination Survey and the Nutrition and Health Survey in Taiwan (1993–1996).
Results: For most BMI values, the prevalences of hypertension, diabetes, and hyperuricemia were higher for Taiwanese than for US whites. In addition, increments of BMI corresponded to higher odds ratios in Taiwanese than in US whites for hypertriglyceridemia (P = 0.01) and hypertension (P = 0.075). BMI-comorbidity relations were stronger in Taiwanese than in US blacks for all comorbidities studied. BMIs of 22.5, 26, and 27.5 were the cutoffs with the highest sum of positive and negative predictive value for Taiwanese, US white, and US black men, respectively. The same order was observed for women. For BMIs >27, >85% of Taiwanese, 66% of whites, and 55% of blacks had at least one of the studied comorbidities. However, a cutoff close to the median of the studied population was often found by maximizing sensitivity and specificity. Reducing BMI from >25 to <25 in persons in the United States could eliminate 13% of the obesity comorbidity studied. The corresponding cutoff in Taiwan is slightly <24.
Conclusion: These data suggest a possible need to set lower BMI cutoffs for Asians, but where to draw the line is a complex issue.
Key Words: BMI • definitions • obesity • overweight • ethnicity • Asians • diabetes mellitus • hypertension • hyperuricemia • dyslipidemia
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