FIGURE 2.
Percentage difference in cord blood ferritin at delivery in infants of mothers with prepregnancy overweight or obesity vs. normal weight. Prepregnancy BMI was calculated from height measured during pregnancy and prepregnancy weight predicted using a validated algorithm using weight(s) measured during pregnancy and other maternal characteristics (60). Coefficients and 95% CIs are from linear regression models with log cord blood ferritin as the dependent variable, indicator variables for maternal prepregnancy overweight and obesity (reference category: normal weight), and product terms for interactions between prepregnancy weight status and infant sex. Models were adjusted for maternal age, socioeconomic status, and iron supplement intake. The interaction terms between prepregnancy weight status and infant sex were statistically significant (likelihood ratio χ2P value = 0.032).