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Table 1 Characteristics of Chinese children aged 7–16 years in the study

From: Fast food consumption and its associations with obesity and hypertension among children: results from the baseline data of the Childhood Obesity Study in China Mega-cities

Characteristics Overall (n = 1626) Boys (n = 830) Girls (n = 796) P-value
Child health outcomes
Obesity related variables
 BMI, mean (SD) 19.2 (3.9) 19.7 (4.0) 18.6 (3.8) < 0.001
 Waist circumference, mean (SD) 66.0 (10.3) 68.2 (11.1) 63.7 (9.0) < 0.001
 WHtR, mean (SD) 0.44 (0.06) 0.45 (0.06) 0.42 (0.05) < 0.001
Blood pressure
 Systolic blood pressure, mean (SD) 106.0 (12.1) 107.2 (12.4) 104.8 (11.6) < 0.001
 Diastolic blood pressure, mean (SD) 60.9 (7.9) 60.4 (7.7) 61.4 (8.1) 0.017
Child characteristics
 Age (in years), mean (SD) 11.6 (2.0) 11.6 (2.0) 11.5 (2.1) 0.917
 Location, n (%)     0.618
  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 (%)     0.745
  Primary school 839 (51.6) 425 (51.2) 414 (52.0)  
  Middle school 787 (48.4) 405 (48.8) 382 (48.0)  
Their mothers’ characteristics
 BMI, mean (SD) 22.1 (3.2) 21.9 (2.8) 22.4 (3.4) 0.001
 Education level, n (%)     < 0.001
  Elementary school or below 402 (25.6) 242 (30.5) 160 (20.7)  
  Middle, high or vocational school 452 (28.8) 215 (27.1) 237 (30.6)  
  College or above 715 (45.6) 337 (42.4) 378 (48.8)  
  1. Abbreviation: BMI body mass index, SD standard deviation, WHtR waist-height ratio