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Correlation between THC-COOH in cord at delivery with serum and urine at each visit. Urine and serum values are in ng/mL. Umbilical cord THC-COOH values are reported in ng/g. Spearman’s correlation coefficients are reported on each panel with 95% confidence intervals. Clustering of values at 500 ng/mL for urine represents the upper limit of detection of the assay.
