Table 1.
Characteristics of Chinese children aged 7–16 years included in the Childhood Obesity Study in China Mega-cities 2015 survey.
| Overall (n = 1 626) | Boys (n = 830) | Girls (n = 796) | P value* | |
|---|---|---|---|---|
| Child outcomes | ||||
| Obesity-related variables | ||||
| BMI, mean (SD) | 19.2 (3.9) | 19.7 (4.0) | 18.6 (3.8) | <0.0001 |
| Waist circumference, mean (SD) | 66.0 (10.3) | 68.2 (11.1) | 63.7 (9.0) | <0.0001 |
| WHtR, mean (SD) | 0.44 (0.06) | 0.45 (0.06) | 0.42 (0.05) | <0.0001 |
| General obesity (yes), n (%) | 180 (11.1) | 126 (15.2) | 55 (6.9) | <0.0001 |
| Central obesity (yes), n (%) | 320 (19.7) | 227 (27.4) | 93 (11.7) | <0.0001 |
| Blood pressure | ||||
| SBP, mean (SD) | 106.0 (12.1) | 107.2 (12.4) | 104.8 (11.6) | <0.0001 |
| DBP, mean (SD) | 60.9 (7.9) | 60.4 (7.7) | 61.4 (8.1) | 0.0166 |
| Hypertension (yes), n (%) | 146 (9.0) | 77(9.3) | 70 (8.8) | 0.7341 |
| Child factors | ||||
| Age (in years), mean (SD) | 11.6 (2.0) | 11.6 (2.0) | 11.5 (2.1) | 0.9171 |
| Location, n (%) | 0.6176 | |||
| Beijing | 439 (27.0) | 213 (25.7) | 226 (28.4) | |
| Shanghai | 400 (24.6) | 212 (25.5) | 188 (23.6) | |
| Nanjing | 396 (24.4) | 204 (24.6) | 192 (24.1) | |
| Xi’an | 391 (24.1) | 201 (24.2) | 190 (23.9) | |
| School level, n (%) | 0.7453 | |||
| Primary school | 839 (51.6) | 425 (51.2) | 414 (52.0) | |
| Middle school | 787 (48.4) | 405 (48.8) | 382 (48.0) | |
| Maternal factors | ||||
| BMI, mean (SD) | 22.1 (3.2) | 21.9 (2.8) | 22.4 (3.4) | 0.0007 |
| Education level, n (%) | <0.0001 | |||
| Elementary school or below | 402 (25.6) | 242 (30.5) | 160 (20.7) | |
| Middle, high, or vocational schools | 452 (28.8) | 215 (27.1) | 237 (30.6) | |
| College or above | 715 (45.6) | 337 (42.4) | 378 (48.8) | |
BMI, body mass index; SD, standard deviation; WHtR, waist-height ratio; SBP, systolic blood pressure; DBP, diastolic blood pressure.
*P value was calculated from either chi-squared test or t-test.