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Are waist circumference and body mass index independently associated with cardiovascular disease risk in Chinese adults?^1,2,3

¹ From the Department of Epidemiology, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA (RPW, KR, and JH); the Cardiovascular Institute and Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China (DG, XD, and XW); the Department of Medicine, Tulane University School of Medicine, New Orleans, LA (JH); and Tulane Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, New Orleans, LA (JH)

Background: In Western populations, waist circumference (WC) is more predictive of cardiovascular disease (CVD) risk than is body mass index (BMI). It is unclear whether the same is true in Asian populations.

Objective: The objective was to examine the independent effects of WC and BMI on CVD risk factors in China.

Design: CVD risk factors, BMI, and WC were measured in a nationally representative cross-sectional study of 15 540 Chinese adults aged 35–74 y.

Results: Higher WC tertiles were associated with higher blood pressure and higher cholesterol, triacylglycerol, and glucose concentrations within each tertile of BMI and vice versa. In men, the odds of hypertension, dyslipidemia, and the metabolic syndrome (MS) increased with successive WC tertiles (1.0, 1.1, and 1.8, respectively, for hypertension; 1.0, 1.4, and 2.0, respectively, for dyslipidemia; and 1.0, 2.3, and 4.8, respectively, for MS; P for trend < 0.001 for all), even after adjustment for BMI. Similarly, the odds of hypertension, dyslipidemia, and MS increased with successive BMI tertiles (1.0, 1.5, and 2.6, respectively, for hypertension; 1.0, 1.3, and 1.8, respectively, for dyslipidemia; 1.0, 1.3, and 2.9, respectively for MS; P for trend < 0.001 for all), even after adjustment for WC. However, BMI tertiles were not associated with the odds of diabetes after adjustment for WC (P for trend = 0.67), whereas tertiles of WC were significantly associated with the odds of diabetes after adjustment for BMI (1.0, 1.6, and 2.1, respectively; P for trend = 0.002). The results were similar in women.

Conclusions: These data show that WC adds additional risk information to that of BMI in Chinese adults. Measurement of both WC and BMI in Chinese adults may enhance CVD risk stratification.

Key Words: Obesity • body mass index • waist circumference • abdominal obesity • CVD risk factors • China

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