Characteristics of children with known versus unknown SES trajectories.

<p>IL-6, interleukin-6; SES, socioeconomic status; SGA, small for gestational age.</p><p>IL-6 production induced by LPS treatment of PBMC.</p>1<p>Exclusive breastfeeding ≥3 months;</p>2<p>Mother smoked during pregnancy and/or first year after birth; ³Comparisons by chi-squared test (categorical variables) or t-test (continuous variables).