. Author manuscript; available in PMC: 2011 May 1.

Published in final edited form as: Paediatr Perinat Epidemiol. 2010 May;24(3):262–271. doi: 10.1111/j.1365-3016.2010.01114.x

Table 3.

(Multivariable Linear Regression Models) Mean Difference in Age- and Gender-standardized Weight, Length and Weight-for-length (z-scores) at 12 Months per 10 ng/g-month Increase in Lactational Exposure Metrics of PCB153, PCBs, p,p’-DDT and p,p’-DDE.

LEM	Weight		Length		Weight-for-length
(per 10 (ng/g)-month)	β ^a	95% CI	β ^a	95% CI	β ^a	95% CI
PCB153	0.0007	[−0.01, 0.01]	0.002	[−0.007, 0.01]	−0.001	[−0.01, 0.01]
ΣPCBs	−0.00002	[−0.003, 0.003]	0.0002	[−0.002, 0.003]	−0.0004	[−0.004, 0.003]
p,p’-DDT	−0.007	[−0.04, 0.03]	−0.003	[−0.03, 0.03]	−0.007	[−0.05, 0.04]
p,p’-DDE	0.0005	[−0.0002, 0.001]	0.0004	[−0.0002, 0.001]	0.0002	[−0.0006, 0.001]

Abbreviation: CI, confidence interval; p,p’-DDE, 2,2-bis(p-chlorophenyl)-1,1-dichloroethylene; p,p’-DDT, 2,2-bis(p-chlorophenyl)-1,1,1-trichloroethane; LEM, lactational exposure metrics; and PCB, polychlorinated biphenyls.

Adjusted for z-score of birthweight, preterm birth (yes vs. no), maternal race (nonwhite vs. white), education (<16 years vs. ≥16 years), income as a percentage of the poverty level during pregnancy (100%), parity (0 vs. ≥1) and maternal pre-pregnancy body mass index (kg/m²)