Table 1.

Distribution^* of PCBs, OH-PCBs, and PCP, measured in Slovak maternal and cord blood serums collected from mothers at time of delivery

	Maternal Serum					Cord Serum					Median Ratio of Cord/Mother
	10^th percentile	Median	90^th percentile	Mean	SD	10^th percentile	Median	90^th percentile	Mean	SD
	mg/mL					mg/mL					Ratio
Lipid	8.49	10.6	13.1	10.6	2.07	1.87	2.55	3.14	2.58	0.57	0.25
*PCBs*	ng/mL wet wt.					ng/mL wet wt.					Ratio
CB-118	0.03	0.12	0.30	0.17	0.23	0.01	0.01	0.06	0.03	0.05	0.12
CB-153	0.73	1.54	3.87	1.97	1.68	0.10	0.30	0.61	0.38	0.33	0.19
CB-105	0.01	0.02	0.08	0.04	0.06	0.002	0.004	0.005	0.004	0.007	0.16
CB-138	0.42	0.95	2.43	1.29	1.20	0.07	0.22	0.47	0.28	0.27	0.21
CB-180	0.57	1.27	3.51	1.85	1.64	0.07	0.25	0.61	0.33	0.28	0.18
CB-170	0.26	0.55	1.60	0.81	0.73	0.02	0.10	0.25	0.13	0.12	0.16
^aΣPCBs	2.13	4.50	11.8	6.13	5.37	0.30	0.92	1.99	1.21	1.05	0.18
*OH-PCBs*	ng/g wet wt.					ng/g wet wt.					Ratio
4-OH-CB107	0.01	0.03	0.08	0.04	0.05	0.01	0.01	0.05	0.03	0.04	0.57
3-OH-CB153	0.02	0.06	0.18	0.08	0.08	0.02	0.04	0.10	0.05	0.05	0.68
4-OH-CB146	0.04	0.09	0.28	0.14	0.18	0.03	0.07	0.18	0.11	0.16	0.78
3′-OH-CB138	0.02	0.06	0.13	0.07	0.07	0.02	0.06	0.13	0.07	0.07	1.01
4-OH-CB187	0.08	0.17	0.57	0.26	0.29	0.06	0.11	0.26	0.16	0.20	0.68
4′-OH-CB172	0.01	0.03	0.10	0.05	0.07	0.02	0.03	0.09	0.05	0.08	1.03
^bΣOH-PCBs	0.21	0.44	1.23	0.65	0.70	0.15	0.33	0.90	0.48	0.56	0.75
*PCP*	0.33	0.65	1.40	1.02	1.51	0.37	0.69	1.64	1.12	1.64	1.10
	Ratio					Ratio
OH-PCB/PCB	0.05	0.09	0.15	0.10	0.04	0.20	0.38	0.74	0.41	0.21

These distributions represent the full cohort of 1087 pairs of mothers and cords were obtained using weights inversely proportional to the sampling probabilities.

ΣPCBs: 28, 52, 101, 123/149, 118, 114, 153, 105, 138, 167, 156/171, 157, 180, 170, and 189.

ΣOH-PCBs: 4-OH-CB107, 3-OH-CB153, 4-OH-CB146, 3′-OH-CB138, 4-OH-CB187, 4′-OH-CB172.