A Study on Relationship among Body Mass Index(BMI),Waist Circumference(WC) and Blood Pressure in Liaoning Province Population

Objective To explore the relationship among body mass index(BMI),waist circumference(WC),blood pressure and the prevalence rate of hypertension in Liaoning province population. Method Samples were selected according to the multistage clustering sampling.Blood pressure,height,weight and waist circumference of 15 and 15～ year old residents in Liaoning area were measured,and descriptive statistical analysis were used. Results As the BMI increased from 18.5,18.5～23.9,24～27.9 to 28～,the average blood pressure were 116.4/73.9 mmHg,122.0/76.5 mmHg,130.5/81.4 mmHg and 138.4/85.9 mmHg respectively,and the prevalence rates of hypertension were 13.6%,20.4%,35.2% and 53.9% respectively.When waist circumference varied from normal level to abdominal obesity,the average blood pressure increased from 121.7/76.6 mmHg to 133.6/82.9 mmHg,and the prevalence rate of hypertension varied from 19.8% to 42.8%.As BMI≥24 or WC≥the abdominal obesity cut-off point,blood pressure and the prevalence rate of hypertension increased significantly.Multifactor linear regression analysis indicated blood pressure was significantly positive correlated with BMI and WC.The effect of WC on blood pressure was more than that of BMI on blood pressure.Logistic regression analysis indicated that odds ratios of hypertension in overweight,obesity and abdominal obesity groups were respectively 1.5、2.6 and 2.0 times than that of normal weight group. Conclusion Overweight and obesity were important independent risk factors of hypertension.It played an decision role in control of the prevalence rate of hypertension to keep ideal weight and waist circumference.