Table 2. Prevalence of hypertension by key risk factors.

	Frequency	Proportion (%)	Odds ratio (95% CI)	P-value
Age
35–44	385	12.1	1	NA
45–54	566	23.7	2.41 (2.02–2.88)	<0.001
55–64	790	38.6	5.67 (4.67–6.88)	<0.001
65–74	605	52.4	12.10 (9.56–15.30)	<0.001
≥75	273	55.0	16.62 (12.23–22.58)	<0.001
Wave
1991	1040	23.8	1	NA
1993	117	29.9	1.25 (0.92–1.71)	0.2
1997	501	33.5	1.38 (1.12–1.71)	0.003
2000	229	31.5	1.14 (0.87–1.50)	0.3
2004	311	32.5	1.20 (0.95–1.52)	0.1
2006	133	31.7	1.23 (0.90–1.66)	0.2
2009	288	31.5	1.36 (1.06–1.74)	0.02
Gender
Male	1342	30.2	1	NA
Female	1277	26.5	0.66 (0.57–0.77)	<0.001
Province
Liaoning	420	38.1	1	NA
Heilongjiang	284	36.9	0.99 (0.73–1.33)	0.9
Jiangsu	331	30.1	0.46 (0.36–0.60)	<0.001
Shandong	410	32.4	0.63 (0.50–0.81)	<0.001
Henan	286	28.5	0.58 (0.45–0.75)	<0.001
Hubei	234	28.1	0.65 (0.50–0.86)	0.002
Hunan	207	23.6	0.56 (0.43–0.74)	<0.001
Guangxi	230	19.3	0.35 (0.26–0.45)	<0.001
Guizhou	217	19.4	0.36 (0.27–0.47)	<0.001
Residency
Urban	1225	33.3	1	NA
Rural	1394	24.9	0.90 (0.78–1.03)	0.1
BMI
Normal	1456	23.3	1	NA
Underweight	160	21.3	0.58 (0.46–0.75)	<0.001
Overweight	788	41.6	2.39 (2.06–2.77)	<0.001
Obesity	225	56.1	4.25 (3.24–5.58)	<0.001
Smoke
No or used	1754	29.0	1	NA
Current smoker	810	26.5	0.83 (0.72–0.97)	0.02
Alcohol use frequency
No	1607	28.2	1	NA
No more than 2 times a week	428	24.1	0.93 (0.79–1.11)	0.4
More than 2 times a week	530	32.4	1.29 (1.07–1.54)	0.007
Have health insurance
No	1431	24.6	1	NA
Yes	1181	34.5	1.15 (0.99–1.32)	0.06
Education
No graduated from primary school	1070	30.5	1	NA
Graduated from primary school	517	25.9	0.90 (0.75–1.07)	0.2
Graduated from middle or school	700	25.2	1.04 (0.87–1.24)	0.7
Tertiary education	207	29.3	0.72 (0.55–0.94)	0.02
Quintiles of income
1	486	22.5	1	NA
2	383	24.6	1.10 (0.90–1.36)	0.4
3	597	32.0	1.25 (1.03–1.52)	0.03
4	550	30.0	1.04 (0.85–1.28)	0.7
5	590	33.0	0.98 (0.78–1.25)	0.9