Methods:

Data for this study were used from the PEACE (China Patient-Centered Evaluative Assessment of Cardiac Events) Million Persons Project, a population-based screening project that enrolled community-dwelling adults, aged 35-75 years. From Sept 15, 2014, to June 20, 2017, a convenience sampling strategy was used to select 141 sites (88 rural counties and 53 urban districts) from all 31 provinces in mainland China. HTN was defined as systolic blood pressure (SBP) of ≥140 mm Hg, or diastolic blood pressure (DBP) of ≥90 mm Hg, or self-reported antihypertensive medication use in the previous 2 weeks. HTN awareness, treatment, and control were defined, respectively, among hypertensive adults as a self-reported diagnosis of HTN, current use of antihypertensive medication, and blood pressure of <140/90 mm Hg. The authors assessed awareness, treatment, and control in 264,475 population subgroups defined a priori by all possible combinations of 11 demographic and clinical factors (age [35-44, 45-54, 55-64, and 65-75 years], sex [men and women], geographical region [western, central, and eastern China], urbanity [urban vs. rural], ethnic origin [Han and non-Han], occupation [farmer and nonfarmer], annual household income [<10 000, 10,000–50,000, and ≥50,000 in Chinese yuan], education [primary school and below, middle school, high school, and college and above], previous cardiovascular events [yes or no], current smoker [yes or no], and diabetes [yes or no]), and their associations with individual and primary healthcare site characteristics.