Table 1 Characteristics of the study participants
| Â | Normal weightb | Overweightc | Total |
|---|---|---|---|
Characteristics | (n = 11,190) | (n = 4998) | (n = 16,188) |
Age (years, mean ± SD)a | 41.59 ± 12.96 | 43.90 ± 12.13 | 42.31 ± 12.75 |
Sexa | |||
 Men | 4982 (44.52) | 2535 (50.72) | 7517 (46.44) |
 Women | 6208 (55.48) | 2463 (49.28) | 8671 (56.78) |
Nationalitya | |||
 Han | 10,438 (93.28) | 4741 (94.86) | 15,179 (93.77) |
 Other | 752 (6.72) | 257 (5.14) | 1009 (6.23) |
Education | |||
 Junior college or higher | 2809 (25.10) | 1213 (24.27) | 4022 (24.85) |
 Middle school | 6666 (59.57) | 3004 (60.10) | 9670 (59.74) |
 Primary school | 1343 (12.00) | 614 (12.28) | 1957 (12.09) |
 No school | 372 (3.32) | 167 (3.34) | 539 (3.33) |
Family income/year (Yuan)a | |||
  ≤ 5000 | 988 (8.83) | 364 (7.28) | 1352 (8.35) |
 5001–10,000 | 1505 (13.45) | 748 (14.97) | 2253 (13.92) |
 10,001–30,000 | 5557 (49.66) | 2561 (51.24) | 8118 (50.15) |
  ≥ 30,000 | 3140 (28.06) | 1325 (26.51) | 4465 (27.58) |
Smoking status | |||
 Non-smoker | 8001 (71.50) | 3525 (70.53) | 11,526 (71.20) |
 Smoker | 3189 (28.50) | 1473 (29.47) | 4662 (28.80) |
Alcohol consumption | |||
 Non-consumer | 8899 (79.53) | 3909 (78.21) | 12,808 (79.12) |
 Consumer | 2291 (20.47) | 1089 (21.79) | 3380 (20.88) |
Regular exercisea | |||
 No | 8131 (72.66) | 3581 (71.65) | 11,712 (72.35) |
 Yes | 3059 (27.34) | 1417 (28.35) | 4476 (27.65) |
Low calorie and low fat | |||
controlled diet | |||
 No | 8418 (75.23) | 3766 (75.35) | 12,184 (75.27) |
 Yes | 2772 (24.77) | 1232 (24.65) | 4004 (24.73) |
Sugar-sweetened soft drinka | |||
consumption (day per week) | |||
  ≤ 1 | 9466 (84.59) | 4505 (90.14) | 13,971 (86.30) |
 2–4 | 1225 (10.95) | 349 (6.98) | 1574 (9.72) |
  ≥ 5 | 499 (4.46) | 144 (2.88) | 643 (3.97) |
BMI (kg/m2, mean ± SD) | 21.76 ± 2.01 | 27.43 ± 2.46 | 23.51 ± 3.39 |
Family history of hypertension | |||
 No | 7645 (68.32) | 3405 (68.13) | 11,050 (68.26) |
 Yes | 3545 (31.68) | 1593 (31.87) | 5138 (31.74) |
Prehypertensiona | |||
 No | 5462 (48.81) | 1339 (26.79) | 6801 (42.01) |
 Yes | 5728 (51.19) | 3659 (73.21) | 9387 (57.99) |
Per capita GDP (Yuan)d | Â | Â | 70,352 (47,639, 100,423) |
PD (person/km2)d | Â | Â | 8475 (3824, 12,667) |
Air pollutants (μg/m3)d | |||
 PM10 |  |  | 123 (116, 135) |
 SO2 |  |  | 48 (44, 64) |
 NO2 |  |  | 33 (31, 40) |
 O3 |  |  | 50 (41, 63) |