Table 1 Sociodemographic characteristics of the study population

N

137

133

127

550

Male gender, n(%)

125 (91.2)

116 (87.2)

107 (84.3)

476 (86.5)

3.135

0.375

Ethnicity, n(%)

1.208

0.751

 Han

136 (99.3)

130 (97.7)

125 (98.4)

539 (98.0)

 Minorities

1 (0.7)

3 (2.3)

2 (1.6)

11 (2.0)

Educational level, n(%)

8.628

0.196

  < 6 years

3 (2.2)

3 (2.3)

2 (1.6)

6 (1.1)

 6–12 years

103 (75.7)

94 (70.7)

87 (69.6)

361 (65.6)

  > 12 years

30 (22.1)

36 (27.1)

36 (28.8)

183 (33.3)

Mean age, years

39.0 ± 0.2

38.7 ± 0.5

38 ± 0.3

37.5 ± 0.6

411.82

< 0.0001

Marital status

4.147

0.657

 Not married

3 (2.2)

2 (1.5)

2 (1.6)

3 (0.5)

 Married

126 (93.6)

125 (94)

119 (93.7)

515 (93.6)

 Divorce, remarriage and widowhood

8 (5.8)

6 (4.5)

6 (4.7)

32 (5.8)

Occupation, n(%)

1.810

0.575

 Manual labor

111 (84.7)

112 (87.5)

101 (82.1)

438 (82.2)

 Others

26 (15.3)

21 (12.5)

25 (17.9)

115 (17.8)

Smoking history, n(%)

3.413

0.756

 Smoker

68 (49.6)

65 (49.2)

61 (48.8)

277 (50.9)

 Former smoker

15 (10.9)

10 (7.6)

8 (6.4)

54 (9.9)

 Non-smoker

54 (39.4)

57 (43.2)

56 (44.8)

213 (39.2)

Drinking, n(%)

4.008

0.261

 No drinking

36 (26.3)

45 (33.8)

40 (31.5)

150 (27.3)

 Light drinking

84 (61.3)

77 (57.9)

81 (63.8)

369 (67.1)

 Heavy drinking

17 (12.4)

11 (8.3)

6 (4.7)

31 (5.6)

Family loss in the earthquake, n(%)

65 (47.4)

62 (46.6)

247 (44.9)

55 (43.3)

0.585

0.900

Diabetes mellitus, n(%)

11 (8.0)

10 (7.5)

15 (11.8)

28 (5.1)

8.045

0.045