Table 1 Distributions of demographics and lifestyle factors by gender

Age (years) ^a

41.7±14.4

41.2±14.5

42.2±14.4

<0.001

BMI (kg/m²) ^a

23.8±3.7

24.2±3.8

23.5±3.7

<0.001

WC (cm) ^a

81.4±11.1

84.0±10.9

78.8±10.6

<0.001

Ethnic

 Han

23169 (92.0)

11179 (90.1)

11990 (93.8)

<0.001

 Others

2027 (8.0)

1234 (9.9)

793 (6.2)

Educational level

 No school

983 (3.9)

177 (1.4)

806 (6.3)

<0.001

 Primary school

3225 (12.8)

1314 (10.6)

1911 (15.0)

 Junior high school

14736 (58.5)

7434 (59.9)

7302 (57.1)

 ≥Senior high school

6252 (24.8)

3488 (28.1)

2764 (21.6)

Occupation

 Blue-collar worker

11887 (47.2)

4732 (38.1)

7155 (56.0)

<0.001

 White-collar worker

4011 (15.9)

2198 (17.7)

1813 (14.2)

 Cadres

1894 (7.5)

1188 (9.6)

706 (5.5)

 Others

7404 (29.4)

4295 (34.6)

3109 (24.3)

Family income/year ^b

 <10,000 RMB

2484 (9.9)

1376 (11.1)

1108 (8.7)

<0.001

 10,000-30,000 RMB

3286 (13.0)

1275 (10.3)

2011 (15.7)

 30,000-50,000 RMB

13004 (51.6)

6522 (52.5)

6482 (50.7)

 >50,000RMB

6422 (25.5)

3240 (26.1)

3182 (24.9)

Parental obesity

 No

20178 (80.1)

9775 (78.8)

10363 (81.1)

<0.001

 Yes

5018 (19.9)

2638 (21.2)

2420 (18.9)

Physical activity

 Low

18207 (72.3)

8638 (69.6)

9569 (74.9)

<0.001

 High

6989 (27.7)

3775 (30.4)

3214(25.1)

Cigarette smoking

 Never

17180 (68.2)

5256 (42.3)

11924 (93.2)

<0.001

 Current

7094 (28.1)

6356 (51.2)

738 (5.8)

 Former

922 (3.7)

801 (6.5)

121 (1.0)

Alcohol consumption

 Never

19240 (76.4)

6849 (55.2)

12391 (96.9)

<0.001

 1 drink per day

842 (3.3)

788 (6.3)

54 (0.4)

 ≥2 drinks per day

5114 (20.3)

4776 (38.5)

338 (2.7)

Eat fried foods

 Never

19820 (78.7)

8675 (69.9)

11145 (87.2)

<0.001

 Yes

5376 (21.3)

3738 (30.1)

1638 (12.8)

Have a diet low in fat/calorie

 No

17365 (68.9)

8015 (64.6)

9350 (73.1)

<0.001

 Yes

7831 (31.1)

4398 (35.4)

3433 (26.9)