Table 4. Trends in crude and aged-standardized prevalence of hypertension among adults in the China Health and Nutrition Survey 1991–2015.

Group	Prevalence	1991	1993	1997	2000	2004	2006	2009	2011	2015	AC	RC	Ptrend-value
AC: absolute change (prevalence in 2015–prevalence in 1991); RC: relative change [(prevalence in 2015–prevalence in 1991)/prevalence in 1991].
All
	Crude	14.0%	15.4%	19.6%	20.7%	24.2%	23.6%	29.0%	27.7%	34.1%	20.1%	143.6%	< 0.001
	Age-standardized	15.3%	16.0%	18.9%	19.4%	20.3%	18.7%	22.0%	20.3%	25.6%	10.3%	67.3%	< 0.001
Sex
Male
	Crude	16.2%	17.1%	21.9%	23.2%	26.8%	25.9%	31.2%	30.2%	39.6%	23.4%	144.4%	0.002
	Age-standardized	17.2%	17.6%	21.5%	21.9%	23.1%	21.4%	25.0%	23.3%	30.9%	13.7%	79.7%	0.002
Female
	Crude	12.2%	13.9%	17.4%	18.5%	21.8%	21.7%	26.9%	25.5%	28.8%	16.6%	136.1%	< 0.001
	Age-standardized	13.7%	14.6%	16.5%	17.1%	17.8%	16.5%	19.3%	17.8%	21.3%	7.6%	55.5%	< 0.001
Age, yrs
20–39	Crude	4.5%	5.7%	7.4%	7.9%	8.4%	7.1%	8.3%	6.8%	11.0%	6.5%	144.4%	0.013
40–59	Crude	17.4%	18.1%	21.5%	22.3%	24.0%	22.5%	28.0%	25.8%	32.6%	15.2%	87.4%	< 0.001
60–79	Crude	43.0%	41.9%	47.4%	47.0%	47.9%	45.1%	49.9%	48.2%	53.8%	10.8%	25.1%	0.665
Area
Urban
	Crude	18.2%	19.5%	21.7%	23.8%	27.6%	25.7%	30.8%	27.8%	32.4%	14.2%	78.0%	0.113
	Age-standardized	18.8%	19.1%	20.2%	21.0%	22.3%	19.5%	22.6%	19.8%	22.9%	4.1%	21.8%	0.113
Rural
	Crude	11.9%	13.5%	18.5%	19.2%	22.4%	22.6%	28.1%	27.6%	35.2%	23.3%	195.8%	< 0.001
	Age-standardized	13.3%	14.4%	18.2%	18.5%	19.2%	18.3%	21.7%	20.6%	27.4%	14.1%	106.0%	< 0.001