Association of change trend of blood pressure with BMI and waist circumference among residents in Jiangsu province,2007-2010

ObjectiveTo explore the change trend of blood pressure level and its relationship with risk factors of hypertension for the prevention and control of hypertension in Jiangsu province. MethodsBased on differences in geographic location,population distribution and gross national product (GDP),we selected 14 surveillance sites with multi-stage cluster random sampling and two investigations including questionnaire survey and physical examination were carried out among 4 202 and 7 283 residents aged 18-69 years selected with Kish table method from the 14 sites in 2007 and 2011. ResultsCompared with 2007,the prevalence of self-reported hypertension (17.7%1 287/7 283 vs 13.8%581/4 203, χ²=28.974,P=0.000),incidence of hypertension (32.4%1 940/5 996 vs 22.8% 826/3 621,χ²=104.828,P=0.000) and prevalence of hypertension (44.3% 3 287/7 283 vs 33.5% 1 407/4 203,χ²=75.400,P=0.000) in 2010 were significantly higher(P<0.05 for all).The average systolic blood pressure (SBP),diastolic blood pressure (DBP),body mass index (BMI) in male and femal and waist circumference in male were significant higher in 2010 than those in 2007(P<0.05 for all),but female waist circumference(80.3±10.2 cm vs 79.6±8.8 cm,t=2.555;P=0.011) was lower in 2010 than that in 2007(P<0.05).The results of correlation analysis showed that blood pressure was positively correlated with BMI and waist circumference.The results of logistic regression analysis showed that age,BMI,and waist circumference were independent risk factors to hypertension (BMI:ExpB=1.085,95% confidence interval95%CI:1.062-1.107,P=0.000). ConclusionThe prevalence rate of hypertension and its independent risk factors significantly increased among adult residents in Jiangsu province from 2007 to 2010 and BMI is a major contributor to hypertension.