Ko G T, Tang J, Chan J C, Sung R, Wu M M, Wai H P, Chen R
Department of Medicine, Alice Ho Miu Ling Nethersole Hospital, 11, Chuen On Road, Tai Po, Hong Kong.
Br J Nutr. 2001 Feb;85(2):239-42. doi: 10.1079/bjn2000251.
There is increasing evidence suggesting that the cut-off values for defining obesity used in the Western countries cannot be readily applied to Asians, who often have smaller body frames than Caucasians. We examined the BMI and body fat (BF) as measured by bioelectrical impedance in 5153 Hong Kong Chinese subjects. We aimed to assess the optimal BMI reflecting obesity as defined by abnormal BF in Hong Kong Chinese. Receiver operating characteristic curve (ROC) analysis was used to assess the optimal BMI predicting BF at different levels. The mean age and SD of the 5153 subjects (3734 women and 1419 men) was 51.5 (SD 16.3) years (range: 18.0-89.5 years, median: 50.7 years). Age-adjusted partial correlation (r) between BMI and BF in women and men were 0.899 (P < 0.001) and 0.818 (P < 0.001) respectively. Using ROC analysis, the BMI corresponding to the conventional upper limit of normal BF was 22.5-23.1 kg/m(2), and the BMI corresponding to the 90 percentiles of BF was 25.4-26.1 kg/m(2). Despite similar body fat contents, the BMI cut-off value used to define obesity in Hong Kong Chinese should be lower as compared to Caucasians. We suggest a BMI of 23 kg/m(2) and 26 kg/m(2) as the cut-off values to define overweight and obesity respectively in Hong Kong Chinese.
越来越多的证据表明，西方国家用于定义肥胖的临界值不能直接应用于亚洲人，因为亚洲人的体型通常比白种人小。我们对5153名中国香港受试者进行了生物电阻抗测量的体重指数（BMI）和体脂（BF）检测。我们旨在评估反映中国香港人肥胖的最佳BMI，肥胖定义为异常体脂。采用受试者工作特征曲线（ROC）分析来评估不同水平下预测体脂的最佳BMI。这5153名受试者（3734名女性和1419名男性）的平均年龄和标准差分别为51.5（标准差16.3）岁（范围：18.0 - 89.5岁，中位数：50.7岁）。女性和男性BMI与体脂之间的年龄调整偏相关系数（r）分别为0.899（P < 0.001）和0.818（P < 0.001）。通过ROC分析，正常体脂常规上限对应的BMI为22.5 - 23.1 kg/m²，体脂第90百分位数对应的BMI为25.4 - 26.1 kg/m²。尽管体脂含量相似，但与白种人相比，用于定义中国香港人肥胖的BMI临界值应更低。我们建议将23 kg/m²和26 kg/m²的BMI分别作为中国香港人超重和肥胖的临界值。
