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To investigate the significance of waist circum-ference (WC), body mass index (BMI) and hyperinsuli-naemia A (Hlns) in evaluating metabolic syndrome (MS). Clinical data from middle-aged and senile indivi-duals (middle-senile group) who received glucose tol-erance test after diabetes mellitus screening and a group of subjects who received annual oral glucose tolerance test (OGTT) for diabetes mellitus screening (adult group) were collected. Data were collected by use of special mes-sengers, input into a computer data base and analyzed using SAS 5.0 software by expert staff. Abnormal WC and BMI were determined according to Inteational Diabetes Federation (IDF) and Chinese Diabetes Society (CDS) criteria. Hlns was ascertained if fasting insulin (Fins)≥15 mU/L, and/or 2-hour insulin after a glucose challenge was (2hPIns)≥80 mU/L. Abnorma-lities in WC, BMI and Hlns were all found to be risk factors for abnormal glucose metabolism, hypertension and dyslipidemia. In the middle-senile group, the abnor-mality rate of WC and Hlns as well as the overall insulin level were significantly higher than those in the adult group. The abnormality rate of BMI was higher in the adult group, and HIns was mostly seen in impaired glu-cose test (IGT) and normal glucose test (NGT). The con-cordance rate of WC and BMI diagnostic criteria for evaluating obesity in the middle-senile and adult groups were 77.5% and 74.3%, respectively. When only the WC criterion was used for evaluating the existence of insulin resistance, there was a 28.2% missed diagnosis rate for MS patients. WC, BMI and Hlns were all risk factors for abnormal glucose metabolism, hypertension and dyslipi-demia. There was differing prevalence in the different populations. The combination of WC, BMI and Hlnsmight be more helpful in identifying MS at early stage.