Table 2. Prevalence, undiagnosed, untreated and uncontrolled hypertension in China from 2011 to 2015, by region based on economic status^a.

	2011				2013				2015
	N	Unweighted	Weighted	P value	N	Unweighted	Weighted	P value	N	Unweighted	Weighted	P value
Prevalence											—
Class 1	120	46.7	54.3	0.052	69	51.9	56.0	0.105	58	53.7	52.1	0.266
Class 2	1,614	40.6	43.2		1,420	43.7	41.5		1,519	43.4	41.5
Class 3	702	36.8	40.9		604	42.1	43.9		601	40.3	42.2
Class 4	2,052	36.7	37.5		1,929	42.8	43.8		1,966	40.9	41.6
Class 5	797	39.9	40.8		644	41.1	42.9		730	41.2	41.3
Undiagnosed
Class 1	24	20.0	14.4	<0.001	18	26.1	12.6	0.017	9	15.5	11.1	0.068
Class 2	707	43.8	47.7		528	37.2	42.2		507	33.4	33.4
Class 3	306	43.6	40.0		248	41.1	38.4		193	32.1	33.1
Class 4	867	42.3	42.3		744	38.6	40.4		596	30.3	30.2
Class 5	405	50.8	50.9		252	39.1	42.3		253	34.7	34.8
Untreated
Class 1	31	25.8	21.0	<0.001	21	30.4	22.3	0.030	10	17.2	11.7	0.014
Class 2	801	49.6	53.7		640	45.1	48.5		628	41.3	40.7
Class 3	357	50.9	46.4		302	50.0	47.2		227	37.8	39.2
Class 4	1,044	50.9	51.0		899	46.6	47.3		729	37.1	36.2
Class 5	473	59.4	60.2		319	49.5	52.1		300	41.1	41.1
Uncontrolled
Class 1	75	62.5	75.0	0.260	43	62.3	56.2	0.062	38	65.5	59.5	0.335
Class 2	1,274	78.9	82.1		1,079	76.0	79.3		1,112	73.2	71.3
Class 3	575	81.9	79.1		487	80.6	79.9		440	73.2	72.6
Class 4	1,617	78.8	78.4		1,480	76.7	76.4		1,416	72.0	71.0
Class 5	672	84.3	85.1		513	79.7	81.9		542	74.3	74.4

^aClass 1 is the richest region and Class 5 the poorest region.