trends and associated factors of hypertension among residents aged ≥15 years in guangzhou, china, 2004–2013

Background: we aimed to describe the trends and associated factors of hypertension among residents aged ≥15 yr in guangzhou, china. methods: three standardized cross-sectional health surveys were conducted in 2004, 2009 and 2013 using a multi-stage cluster sampling method, and a total of 69128 qualified participants were included in the study. the data were obtained through physical health examination and questionnaire survey. results: the age-standardised prevalence of hypertension increased from 12.5% to 16.0% between 2004 and 2009 and declined from 16.0% to 14.0% between 2009 and 2013, and crude prevalence respectively was 14.6%, 19.1% and 18.8% in 2004, 2009 and 2013. the proportion of optimal blood pressure dropped from 51.1% to 33.2%, high-normal blood pressure increased from 20.1% to 28.9%, grade 1 hypertension and grade 2 or 3 hypertension increased from 11.5% to 13.6% and 3.9% to 5.8% between 2004 and 2013. the average age was significantly increased (p<0.001) from 42.8 to 47.5 yr, and the average body mass index slightly increased (p<0.001) from 22.4 to 23.0. logistic regression analysis shows that higher age, male, higher body mass index, smoking and drinking alcohol were potential risk factors for hypertension. conclusion: both crude and age-standardized prevalence of hypertension were initially increased, but subsequently decreased in guangzhou during 2004–2013. the optimal blood pressure population decreased signifi-cantly while the high-normal blood pressure population increased substantially during the survey period.