Table 2. Prevalence of prehypertension and hypertension stratified by sex and age.

Age (year)	Total (n = 15296)				Female (n = 9017)				Male (n = 6279)				P*value	P& value	PΔ value
	N	NMT	PHT	HT	N	NMT	PHT	HT	N	NMT	PHT	HT
Overalla	15296	38.7	32.3	29.0	9017	44.2	27.6	28.2	6279	30.7	39.2	30.1	<0.001	0.049	0.469
15~24	1337	65.5	32.6	1.9	766	79.1	20.0	0.9	571	47.3	49.6	3.1	<0.001	<0.001	0.416
25~34	1334	61.9	32.8	5.3	758	77.3	19.1	3.6	576	41.5	50.9	7.6	<0.001	<0.001	0.904
35~44	2087	56.7	33.7	9.6	1254	67.7	25.1	7.2	833	40.2	46.7	13.1	<0.001	<0.001	0.904
45~54	2934	41.7	37.6	20.7	1861	46.2	34.3	19.5	1073	34.0	43.3	22.7	<0.001	<0.001	0.417
55~64	3068	29.7	32.5	37.8	1858	31.3	31.2	37.5	1210	27.4	34.4	38.2	0.012	<0.001	0.345
65~74	2685	22.0	29.3	48.7	1480	23.2	26.8	50.0	1205	20.5	32.3	47.2	0.005	0.093	0.007
75~97	1851	16.4	26.0	57.6	1040	15.2	24.8	60.0	811	17.9	27.5	54.6	0.683	0.514	0.075
P value			<0.001	<0.001			<0.001	<0.001			0.009	<0.001

Note: Values are percentages.

HT, Hypertension; NMT, normotension; PHT, prehypertension.

^aAge-standardized prevalence rate.

* Comparison between prehypertension and normotension in different genders;

^& comparison between hypertension and normotension;

^Δ comparison between prehypertension and hypertension.

A P value of less than 0.017 was considered statistically significant.