Interval estimation of the hypertension prevalence among person aged over 18 years in China

Objective To estimate the hypertension prevalence among person aged over18 years in China and its 95% confidence interval.Methods SUDAAN 10.0.1 was used to estimate the weighted hypertension prevalence among person aged over 18 years in China.And their variance and 95% confidence interval were estimated by Taylor series meth-od.Results The prevalence of hypertension among person aged over 18 years in China was 19.14%,and its 95% confi-dence interval was 18.15% to 20.12%.The average systolic blood press was 120.0 mmHg,its 95% confidence interval was 119.4 mmHg to 120.6 mmHg.The average diastolic blood press was 76.4 mmHg,its 95% confidence interval was 76.0 mmHg to 76.8 mmHg.Conclusion The formulas of simple random sampling were not suitable for the point and in-terval estimators of complex sample.They could be estimated by sampling design.And weighted estimator for complex sam-pling could avoid the biased estimator for results.