Table 2.

Distributions of biomarkers of prenatal organochlorine and metal exposure ^a among New Bedford Cohort participants included in at least one complete case analyses for the revised Conners’ Rating Scale (CRS) outcomes at age 8 years and/or the Behavior Assessment System for Children, Second Edition (BASC-2), outcomes at age 15 years (n=468) ^b

	Total cohort (n=468)			Boys (n=234)			Girls (n=234)
	Mean ± SD	Median	Range	Mean ± SD	Median	Range	Mean ± SD	Median	Range
Organochlorines
HCB (ng/g)	0.03 ± 0.02	0.02	0.00 – 0.14	0.02 ± 0.02	0.02	0.00 – 0.14	0.03 ± 0.02	0.02	0.00 – 0.13
p,p'-DDE (ng/g)	0.53 ± 1.12	0.31	0.02 – 14.9	0.49 ± 0.82	0.32	0.02 – 10.3	0.57 ±1.35	0.31	0.06 – 14.9
ΣPCB4 c (ng/g)	0.26 ± 0.32	0.18	0.01 – 4.41	0.23 ± 0.21	0.17	0.01 – 1.69	0.28 ± 0.41	0.19	0.01 – 4.41
Metals
Pb (μg/dL)
Cord blood	1.38 ± 0.94	1.14	0.00 – 9.39	1.41 ± 0.86	1.21	0.13 – 5.25	1.36 ± 1.02	1.08	0.00 – 9.39
Peak childhood d	6.66 ± 3.93	6.00	1.00 – 38.0	6.51 ± 3.70	6.00	1.00 – 19.2	6.83 ± 4.16	6.00	1.00 – 38.0
Mn (μg/dL)	4.21 ± 1.53	3.96	0.66 – 14.6	4.34 ± 1.51	4.15	0.66 – 11.2	4.08 ± 1.54	3.72	1.75 – 14.6

Abbreviations: HCB: hexachlorobenzene; Mn: manganese; Pb: lead; PCB: polychlorinated biphenyl; p,p'-DDE: p,p’-dichlorodiphenyldichloroethylene; SD: standard deviation

^aOrganochlorines were measured in cord serum; prenatal Pb and Mn were measured in cord whole blood; peak childhood Pb was measured in whole blood

^bSample sizes: 468 for cord serum organochlorines, cord blood Pb, and cord blood Mn; 434 for peak childhood Pb

^cSum of four PCB congeners (118, 138, 153, 180)

^dPeak childhood blood lead levels from ages 12 to 36 months