Prevalence and risk factors of hypertension for the middle-aged population in China — results from the China Health and Retirement Longitudinal Study (CHARLS)

Background: The prevalence of hypertension in middle-aged people is increasing. However, few studies have examined the risk factors of hypertension among the middle-aged population. The aim of this study is to present the prevalence of hypertension and its risk factors for the middle-aged population in China. Methods: The data were from the third-wave national survey (2015) of the China Health and Retirement Longitudinal Study (CHARLS). A total of 7,178 respondents aged 45–59 years were included in this study. Hypertension was defined as SBP ≥ 140 mmHg and/or DBP ≥ 90 mmHg or currently taking antihypertensive medicines. Multivariate logistic regression analyses were used to identify the risk factors of hypertension. Results: The prevalence of hypertension was 29.12% (95%CI = 28.07–30.17). Hypertension was more prevalent among men than women (31.63% vs. 27.03%). Older age, higher BMI, chronic diseases, and poor health status were independently associated with hypertension in both genders (p < 0.05). Among women, college education (OR = 0.302, 95%CI = 0.152–0.598), marriage or cohabitation (OR = 0.756, 95%CI = 0.584–0.98), and drinking more than once a month (OR = 0.645, 95% = 0.498–0.836) led to a decreased likelihood of hypertension. Individuals with larger waist circumference were more likely to have hypertension (OR = 1.57, 95%CI = 1.294–1.906). Conclusion: Our results indicate that hypertension is highly prevalent in the middle-aged population in China. Men are more likely to have hypertension than women. Older age, higher BMI, chronic diseases and poor self-rated health are risk factors for hypertension in both genders. Large waist circumference, singleness, low educational level, and non-drinking are risk factors of hypertension among women but not among men.