data were double-entered in EpiData Entry 3.1( the EpiData Association,Odense,Denmark); cleaning and archiving was done by using eatablished protocols. Extreme and missing data were manually checked to the original paper records,and data entry and logical errors were corrected or updated.
Hypertension was defined according to the 2010 chinese Guidelines for the management of hypertension (13). Participants were classified as hypertensive if their mean systolic blood pressure(SBP) was 140 mm Hg or greater or if their mean diastolic blood pressure(DBP) was 90 mm Hg or greater or if they self-reported currently taking antihypertension medication in the previous 2 weeks(13). Awareness of hypertension was defined as self-report of any previous diagnosis of hypertension by a health care professional. Treatment of hypertension was defined as self-reported use of antihypertension medication. Control of hypertension was defined as treatment of hypertension associated with a mean SBP of less than 140 mm Hg and DBP of less than 90 mm Hg (13).
Sample weights were developed to represent the entire population in shandong province.the total weight was determined by the design weight and poststratification weight(14). The desigh weight was calculated by accounting for cluster design, strata,and individual. The general population of shandong province in 2009 was used for poststratification weight calculations. Taylor-series linearuzation was used to estimate the variance of mean and proportion and to calculate 95% confidence intervals (CIs).Two sets of weights were calculated for the overall sample and for the subsample.