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Table 3 Means and medians of childhood BMI trajectory characteristics, by sex

From: Childhood body mass index trajectories: modeling, characterizing, pairwise correlations and socio-demographic predictors of trajectory characteristics

  Boys (N = 1,680) Girls (N = 1,609)
BMI trajectory characteristics na Mean (SD) Median (range) nb Mean (SD) Median (range)
1 week to infancy peak       
Age at infancy peak, months 1680 7.2 (0.9) 7.1 (3.9, 12.5) 1607 7.4 (1.1) 7.3 (3.3, 14.2)
BMI at infancy peak, kg/m2 1680 17.8 (0.9) 17.7 (15.0, 20.6) 1607 17.3 (0.9) 17.2 (14.5, 20.3)
Change in BMI, kg/m2 1680 10.7 (5.4) 10.7 (-8.2, 30.8) 1607 8.5 (5.1) 8.2 (-12.6, 28.1)
Velocity, kg/m2/month 1680 1.58 (0.82) 1.57 (-1.31, 5.10) 1607 1.21 (0.75) 1.15 (-1.50, 5.65)
Area under curve (kg/m2-months) 1680 114 (18) 112 (60, 207) 1607 116 (21) 113 (45, 242)
Infancy peak to adiposity rebound       
Age at adiposity rebound, months 1643 49.2 (11.9) 50.0 (24.0, 84.2) 1547 46.8 (11.0) 47.1 (24.1, 85.3)
BMI at adiposity rebound, kg/m2 1643 15.6 (1.3) 15.5 (11.9, 19.9) 1547 15.5 (1.2) 15.4 (11.8, 19.4)
Age difference, months 1643 42.0 (12.0) 42.8 (14.2, 76.7) 1547 39.4 (11.2) 40.0 (14.0, 77.0)
Change in BMI, kg/m2 1643 -2.2 (0.8) -2.2 (-4.7, -0.2) 1547 -1.8 (0.7) -1.9 (-4.0, -0.2)
Velocity, kg/m2/month 1643 -0.05 (0.01) -0.05 (-0.08, -0.01) 1547 -0.04 (0.01) -0.05 (-0.08, -0.01)
Area under curve (kg/m2-months) 1643 680 (182) 690 (251, 1332) 1547 629 (170) 633 (239, 1301)
Adiposity rebound to age 18 years       
Change in BMI, kg/m2 1643 8.3 (3.0) 7.5 (2.9, 20.0) 1547 8.1 (2.6) 7.5 (2.6, 18.8)
Velocity, kg/m2/month 1643 0.02 (0.01) 0.02 (0.00, 0.05) 1547 0.02 (0.01) 0.02 (0.00, 0.05)
Area under curve (kg/m2-months) 1643 3206 (590) 3115 (2010, 4985) 1547 3213 (534) 3139 (2008, 4725)
  1. BMI, body mass index; SD, standard deviation
  2. a 37 boys had no adiposity rebound
  3. b 2 girls had no infancy peak and 62 girls had no adiposity rebound