Figure 2From: A prospective cohort study of biomarkers of prenatal tobacco smoke exposure: the correlation between serum and meconium and their association with infant birth weight Adjusted geometric mean meconium nicotine concentration by 16 week and birth serum cotinine category*. *-Adjusted for 26 weeks serum cotinine category (< LOD, LOD - 3 ng/mL, and > 3 ng/mL). Error bars represent 95% CI of the geometric mean.Back to article page