Table 3 Demographic characteristics of the sample

Age, year, mean(SD)^a

32.9(12.6)

29.7(8.6)

32.5(12.2)

Gender, male (%)^b

92(47.9)

14(42.2)

106(47.1)

Ethnicity (%)^c

 Han

174

30

204(90.7)

 Others

18

3

21(9.3)

Marital status (%)^c

 Married or living with partner

95

13

108(48.0)

 Single

93

18

111(49.3)

 Separated or divorced

4

1

5(2.2)

 Widowed

0

1

1(0.4)

Education level (%)^c

 Grade 9 or less

37

4

41(18.3)

 High school

59

12

71(31.6)

 College

81

17

98(43.6)

 Higher than college

15

0

15(6.7)

Smoke, yes (%)^b

34(17.7)

3(9.1)

37(16.4)

Drink wine, yes (%)^b

56(29.2)

9(27.3)

65(28.9)

Exercise, yes (%)^b

88(45.8)

16(48.5)

104(46.2)

Other chronic disease, yes (%)^b

60(31.3)

9(27.3)

69(30.7)

BMI, mean(SD)^a

22.1(3.7)

21.6(3.4)

22.0(3.6)

Duration, year, mean(SD)^a

6.3(6.3)

5.9(4.8)

6.1(6.5)