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Table 1 Characteristics of study participants at baseline (fourth grade) and 3 years later (seventh grade)

From: Changes in overweight/obesity and central obesity status from preadolescence to adolescence: a longitudinal study among schoolchildren in Japan

 In fourth gradeIn seventh grade
Boys (n = 720)Girls (n = 716)P valueaBoys (n = 720)Girls (n = 716)P valuea
Age (years)9.0 (9.0, 10.0)9.0 (9.0, 10.0)0.76412.0 (12.0, 12.0)12.0 (12.0, 12.0)0.142
Height (cm)134.9 (131.1, 139.0)134.4 (130.6, 139.5)0.397153.6 (147.7, 158.8)152.2 (148.5, 156.0)< 0.001
Weight (kg)30.3 (27.4, 34.9)29.5 (26.3, 34.0)0.00142.5 (37.7, 48.5)42.6 (38.3, 47.4)1.000
Body mass index (kg/m2)16.7 (15.5, 18.5)16.2 (15.2, 17.8)< 0.00117.9 (16.7, 19.4)18.2 (17.0, 19.9)0.010
Waist circumference (cm)57.7 (54.4, 62.7)57.3 (54.3, 61.0)0.03163.0 (59.6, 67.3)63.7 (60.0, 67.7)0.073
Waist-to-height ratio0.428 (0.407, 0.459)0.425 (0.407, 0.452)0.0380.41 (0.39, 0.43)0.42 (0.40, 0.44)< 0.001
Overweight/obesity125 (17.4)87 (12.2)0.00582 (11.4)79 (11.0)0.831
Central obesity85 (11.8)57 (8.0)0.01550 (6.9)47 (6.6)0.774
  1. Except where indicated n (%), values are median (25th percentile, 75th percentile)
  2. aWilcoxon’s rank-sum test or chi-square test
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