Table 1 Demographic and clinical characteristics of prehypertension

SBP(mmHg)

128.35 ± 6.00

128.29 ± 5.93

128.42 ± 6.08

-0.590

0.555^a

DBP(mmHg)

75.79 ± 7.28

76.16 ± 7.23

75.38 ± 7.31

2.858

0.004^a

Age group(years), n(%)

6.568

0.087^b

45–54

925(32.5)

454(30.7)

471(34.5)

55–64

1134(39.9)

594(40.1)

540(39.6)

65–74

567(19.9)

316(21.3)

251(18.4)

 ≥ 75

217(7.6)

116(7.8)

101(7.4)

Missing, n(%)

2(0.1)

1(0.1)

1(0.1)

Marital status, n(%)

22.629

 < 0.001^c

Single

336(11.8)

134(9.0)

202(14.8)

Married or cohabiting

2509(88.2)

1347(91.0)

1162(85.2)

Region, n(%)

0.396

0.529^c

Urban

370(13.0)

187(12.6)

183(13.4)

Rural

2463(86.6)

1288(87.0)

1175(86.1)

Missing, n(%)

12(0.4)

6(0.4)

6(0.4)

Education level, n(%)

128.042

 < 0.001^b

Primary and lower

1916(67.3)

856(57.8)

1060(77.7)

Junior/secondary/vocational school

840(29.5)

565(38.1)

275(20.2)

College and higher

89(3.1)

60(4.1)

29(2.1)

Current smoking status, n(%)

377.723

 < 0.001^c

Yes

1072(37.7)

809(54.6)

263(19.3)

No

1773(62.3)

672(45.4)

1101(80.7)

Alcohol habits, n(%)

719.482

 < 0.001^c

Yes

1336(47.0)

1052(71.0)

284(20.8)

No

1505(52.9)

427(28.8)

1078(79.0)

Missing, n(%)

4(0.1)

2(0.1)

2(0.1)

Social activity, n(%)

1.435

0.231^c

No

1231(43.3)

625(42.2)

606(44.4)

Yes

1614(56.7)

856(57.8)

758(55.6)

BMI, n(%)

52.718

 < 0.001^b

Normal

1444(50.8)

837(56.5)

607(44.5)

Underweight

139(4.9)

74(5.0)

65(4.8)

Overweight

875(30.8)

414(28.0)

461(33.8)

Obese

326(11.5)

125(8.4)

201(14.7)

Missing, n(%)

61(2.1)

31(2.1)

30(2.2)

Abdominal obesity, n(%)

209.466

 < 0.001^c

No

997(35.0)

703(47.5)

294(21.6)

Yes

1848(65.0)

778(52.5)

1070(78.4)

Health status, n(%)

18.363

 < 0.001^b

Good

728(25.6)

416(28.1)

312(22.9)

Fair

1509(53.0)

786(53.1)

723(53.0)

Poor

569(20.0)

257(17.4)

312(22.9)

Missing, n(%)

39(1.4)

22(1.5)

17(1.2)

Chronic disease, n(%)

6.163

0.046^b

0

984(34.6)

532(35.9)

452(33.1)

1

887(31.2)

474(32.0)

413(30.3)

 ≥ 2

920(32.3)

449(30.3)

471(34.5)

Missing, n(%)

54(1.9)

26(1.8)

28(2.1)

Sleep duration (h/night),n(%)

32.984

 < 0.001^b

 ≥ 7and < 8

539(18.9)

294(19.9)

245(18.0)

 < 6

883(31.0)

401(27.1)

482(35.3)

 ≥ 6and < 7

639(22.5)

382(25.8)

257(18.8)

 ≥ 8and < 9

493(17.3)

268(18.1)

225(16.5)

 ≥ 9

168(5.9)

87(5.9)

81(5.9)

Missing, n(%)

123(4.3)

49(3.3)

74(5.4)

Nap time(min/day), n(%)

10.475

 < 0.001^b

0

1204(43.3)

536(36.2)

668(49.0)

 > 0 and < 30

194(6.8)

104(7.0)

90(6.6)

 ≥ 30 and < 60

265(9.3)

133(9.0)

132(9.7)

 ≥ 60

1090(38.3)

661(44.6)

429(31.5)

Missing, n(%)

92(3.2)

47(3.2)

45(3.3)