Table 3.

Associations between exposure to di-ortho PCBs and PBDEs and birth weight

	βa	SEb	p	N
Unadjusted modelc
di-ortho PCBsd	−26	44	0.6	411
di-ortho PCBsd - restrictede	2	48	1.0	346
PBDE(4)f	−49	40	0.2	362
PBDE(4)f – restrictede	−47	42	0.3	346
Multivariate modelg
di-ortho PCBsd	137	61	0.02*	346
di-ortho PCBsd - restrictedh	131	74	0.08	254
PBDE(4)f	−54	46	0.2	346
PBDE(4)f – restrictedh	−117	59	0.05*	254
Multivariate model including gestational lengthi
di-ortho PCBsd	143	65	0.03*	254
PBDE(4)f	−106	52	0.04*	254

^aRegression coefficient, i.e. change in birth weight per 1-unit increase in ln-transformed contaminant concentration in breast milk.

^bStandard error.

^cDi-ortho PCB and PBDE(4) were included in separate models.

^dSum of PCB 138, PCB 153 and PCB 180.

^eRegression analysis restricted to individuals with data on all covariates included in the multivariate model.

^fSum of BDE-47, BDE-99, BDE-100 and BDE-153.

^gDi-ortho PCB and PBDE(4) were included in the same model. Other covariates included were age of the mother, pre-pregnancy BMI, weight gain during pregnancy, education, smoking and infant sex.

^hMultivariate regression analysis restricted to individuals with data on gestational length.

ⁱGestational length was added to the covariates in the multivariate model.

*p≤0.05.