Table 1. Nationwide surveys on the prevalence of hypertension in China.

Study name	Time	Age, yrs	Sampling method	Sample size	Prevalence, %
Key project of Chinese Academy of Medical Sciences-hypertension research	1958–1959	≥ 15	Non-random	739,204	5.1
National hypertension sampling survey	1979–1980	≥ 15	Random	4,012,128	7.7
National hypertension sampling survey	1991	≥ 15	Stratified random	950,356	13.6
China Health and Nutrition Survey	2002	≥ 18	Multistage stratified cluster random sampling	272,023	18.8
Survey on the Status of Nutrition and Chronic Diseases of Chinese Residents	2012	≥ 18	Multistage stratified random	–	25.2
China Hypertension Survey	2012–2015	≥ 18	Multistage stratified random	451,755	27.9 (Weighted 23.2)
China Health and Nutrition Survey	2015	20–79	Multistage stratified cluster random	8907	34.1 (Standardized 25.6)
China Chronic Disease and Risk Factor Surveillance	2018	≥ 18	Multistage stratified cluster random	179,873	27.5 (Weighted)