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