Table 1 Characteristics for 9245 participants according to body mass index (BMI) and waist circumference (WC)
Characteristics | BMI | p trend* | WC | p trend* | |||||
|---|---|---|---|---|---|---|---|---|---|
Underweight | Normal | Overweight | Obesity | Normal | Overweight | Obesity | |||
Participants (%) | 401 (4.34%) | 4283 (46.33%) | 3171 (34.30%) | 1390 (15.04%) | Â | 3880 (41.97%) | 3279 (35.47%) | 2086 (22.56%) | Â |
Age (year) | 38.79 ± 14.40 | 45.29 ± 12.66 | 48.52 ± 10.80 | 47.22 ± 11.94 | < 0.001 | 43.36 ± 13.04 | 48.05 ± 11.13 | 49.49 ± 10.94 | < 0.001 |
Male (%) | 149 (37.16%) | 1939 (45.27%) | 1600 (50.46%) | 687 (49.42%) | < 0.001 | 1821 (46.93%) | 1568 (47.82%) | 986 (47.27%) | 0.7545 |
Urban residence (%) | 135 (33.67%) | 1584 (36.98%) | 1264 (39.86%) | 546 (39.28%) | 0.0143 | 1391 (35.85%) | 1286 (39.22%) | 852 (40.84%) | < 0.001 |
Marital status (%) |  |  |  |  | < 0.001 |  |  |  | < 0.001 |
 Never married | 100 (24.94%) | 466 (10.88%) | 142 (4.48%) | 121 (8.71%) |  | 539 (13.89%) | 189 (5.76%) | 101 (4.84%) |  |
 Married | 292 (72.82%) | 3638 (84.94%) | 2901 (91.49%) | 1205 (86.69%) |  | 3210 (82.73%) | 2947 (89.87%) | 1879 (90.08%) |  |
 Divorced or widowed | 9 (2.24%) | 179 (4.18%) | 128 (4.04%) | 64 (4.60%) |  | 131 (3.38%) | 143 (4.36%) | 106 (5.08%) |  |
BMI (kg/m2) | 17.37 ± 1.28 | 21.75 ± 1.46 | 25.79 ± 1.11 | 31.35 ± 5.42 |  | 22.05 ± 3.77 | 24.90 ± 3.84 | 27.92 ± 3.55 | < 0.001 |
WC (CM) | 68.37 ± 10.59 | 78.00 ± 11.15 | 87.23 ± 11.28 | 94.34 ± 15.96 | < 0.001 | 72.11 ± 12.67 | 86.62 ± 3.85 | 98.48 ± 6.49 |  |
Education (%) |  |  |  |  | < 0.001 |  |  |  | < 0.001 |
 ≤ Primary school | 71 (17.71%) | 901 (21.04%) | 748 (23.59%) | 333 (23.96%) |  | 764 (19.69%) | 749 (22.84%) | 540 (25.89%) |  |
 ≤ High school | 134 (33.42%) | 1605 (37.47%) | 1202 (37.91%) | 544 (39.14%) |  | 1461 (37.65%) | 1246 (38.00%) | 778 (37.30%) |  |
 > High school | 196 (48.88%) | 1777 (41.49%) | 1221 (38.51%) | 513 (36.91%) |  | 1655 (42.65%) | 1284 (39.16%) | 768 (36.82%) |  |
Per capita household income (CNY) (%) |  |  |  |  | 0.012 |  |  |  | < 0.001 |
 < 8000 | 120 (29.93%) | 1097 (25.61%) | 748 (23.59%) | 342 (24.60%) |  | 1047 (26.98%) | 762 (23.24%) | 498 (23.87%) |  |
 ≥ 8000 to < 17,000 | 120 (29.93%) | 1071 (25.01%) | 770 (24.28%) | 347 (24.96%) |  | 980 (25.26%) | 834 (25.43%) | 494 (23.68%) |  |
 ≥ 17,000 to < 30,800 | 81 (20.20%) | 1041 (24.31%) | 830 (26.17%) | 365 (26.26%) |  | 926 (23.87%) | 834 (25.43%) | 557 (26.70%) |  |
 ≥ 30,800 | 80 (19.95%) | 1074 (25.08%) | 823 (25.95%) | 336 (24.17%) |  | 927 (23.89%) | 849 (25.89%) | 537 (25.74%) |  |
Employed people (%) | 225 (56.11%) | 2504 (58.46%) | 1816 (57.27%) | 776 (55.83%) | 0.3087 | 2361 (60.85%) | 1856 (56.60%) | 1104 (52.92%) | < 0.001 |
Never smoke (%) | 306 (76.31%) | 3124 (72.94%) | 2301 (72.56%) | 1033 (74.32%) | 0.3016 | 2816 (72.58%) | 2402 (73.25%) | 1546 (74.11%) | 0.4381 |
No alcohol intake (%) | 295 (73.57%) | 2964 (69.20%) | 2166 (68.31%) | 923 (66.40%) | < 0.001 | 2664 (68.66%) | 2239 (68.28%) | 1445 (69.27%) | 0.0926 |
Leisure physical activity (MET-h/week) | 32.55 | 27.30 | 24.85 | 26.18 | < 0.001 | 27.30 | 26.53 | 24.59 | < 0.001 |
Hypertension (%) | 41 (10.22%) | 824 (19.24%) | 1135 (35.79%) | 668 (48.06%) | < 0.001 | 661 (17.04%) | 1035 (31.56%) | 972 (46.60%) | < 0.001 |
Type 2 diabetes (%) | 3 (0.75%) | 84 (1.96%) | 131 (4.13%) | 81 (5.83%) | < 0.001 | 60 (1.55%) | 109 (3.32%) | 130 (6.23%) |  < 0.001 |
Systolic blood pressure (mm Hg) | 115.22 ± 16.05 | 122.21 ± 16.52 | 129.20 ± 16.90 | 134.39 ± 18.03 | < 0.001 | 120.84 ± 16.38 | 127.48 ± 16.81 | 133.50 ± 17.83 | < 0.001 |
Diastolic blood pressure (mm Hg) | 75.15 ± 10.31 | 78.57 ± 9.99 | 83.21 ± 10.55 | 86.83 ± 11.44 | < 0.001 | 78.07 ± 10.11 | 82.24 ± 10.52 | 85.44 ± 11.25 | < 0.001 |