Characteristics at Birth and at Baseline
weight gain
REGRESSION
Abbreviations: BMI, body mass index; ITA, individual typology angle; 24,25(OH)Seasons are based on equinox and solstice dates for each year.Serum 25(OH)D concentrations measured using chemiluminescent immunoassay and standardized using Deming regression (standardized concentration [in nmol/L] calculated as 0.9634 [measured concentration] + 3.122).Measured using liquid chromatography–mass spectrometry/mass spectrometry.Gestational weight gain categories were classified according to pregravid BMI using the Institute of Medicine classification.Calculated as weight in kilograms divided by height in meters squared.Mothers self-reported their own race, as described in detail elsewhere.WB BMC, WB BMC per kilogram bodyweight or BMC per centimeter, LS BMC, and LS BMD were not different between groups across the trial (