Table 1 Sociodemographic characteristics of the patients

Age (years)

43.1 ± 14.7

43.0 ± 14.0

0.957

43.5 ± 14.7

40.2 ± 14.2

45.4 ± 13.1

0.052

Sex, female (%)

284(61.6%)

143(60.6%)

0.806

21 (45.7%)

50 (64.1%)

63 (63.0%)

0.088

Health insurance, yes (%)

400(87.7%)

200(85.5%)

0.406

38 (82.6%)

66 (84.6%)

85 (86.7%)

0.800

Residence, urban (%)

386(83.7%)

187(79.6%)

0.174

35(76.1%)

60(76.9%)

84(84.8%)

0.306

Marital status, married (%)

343(74.4%)

163(69.1%)

0.194

31 (67.4%)

49 (62.8%)

77 (77.0%)

0.364

Family income (monthly, Yuans) (%)

0.196

0.850

Low (< 4000)

145(31.7%)

89(38.0%)

17(37.0%)

32(41.6%)

36(36.4%)

Middle (4000–8000)

162(35.4%)

80(34.2%)

15(32.6%)

24(31.2%)

38(38.4%)

High (> 8000)

151(33.0%)

65(27.8%)

14(30.4%)

21(27.3%)

25(25.3%)

Profession, employed (%)

237(51.4%)

105(44.5%)

0.215

25 (54.3%)

34 (43.6%)

39(39.0%)

0.699

Education, university or higher (%)

230(49.9%)

105(44.5%)

0.227

20 (43.5%)

41 (52.6%)

38 (38.0%)

0.239

Exercise in winter, never (%)

123(26.7%)

70(29.7%)

0.670

15 (32.6%)

20 (25.6%)

33 (33.0%)

0.680

Exercise in summer, never (%)

95(20.6%)

54(22.9%)

0.597

9 (19.6%)

14 (17.9%)

29 (29.0%)

0.113

Smoking, never (%)

340(73.8%)

165(70.2%)

0.473

31 (67.4%)

58 (74.4%)

67 (67.7%)

0.165

Alcohol, never (%)

218(47.3%)

127(54%)

0.385

26 (56.5%)

39 (50.0%)

54 (54.5%)

0.908