Effects of intrauterine exposures to polychlorinated biphenyls, methylmercury, and lead on birth weight in Japanese male and female newborns

Table 2 Correlation coefficients (r) between birth weight and gestational weight gain and the relating indicators

	Birth weight		Body weight gain during pregnancy
	r	p value	r	p value
252 Male newborns
Gestational age	0.413	<0.001	0.145	0.021
Maternal age	−0.022	0.722	−0.278	< 0.001
Body mass index before pregnancy	0.175	0.005	0.059	0.354
Body weight gain during pregnancy	0.200	0.001	-
Fish/seafood intake	0.045	0.473	0.029	0.651
Total PCBs in cord blood^a,b	−0.252	< 0.001	−0.334	< 0.001
PCB-153 in cord blood^a,b	−0.247	< 0.001	−0.325	< 0.001
Total mercury in cord blood^b	−0.130	0.039	−0.007	0.917
Lead in cord blood^b	−0.025	0.698	0.037	0.560
237 Female newborns
Gestational age	0.311	< 0.001	0.116	0.074
Maternal age	0.081	0.212	−0.127	0.050
Body mass index before pregnancy	0.176	0.006	−0.245	< 0.001
Body weight gain during pregnancy	0.251	0.004	-
Fish/seafood intake	0.048	0.465	−0.010	0.874
Total PCBs in cord blood^a,b	−0.170	0.009	−0.270	< 0.001
PCB-153 in cord blood^a,b	−0.179	0.006	−0.264	< 0.001
Total mercury in cord blood^b	−0.023	0.720	0.039	0.555
Lead in cord blood^b	−0.030	0.642	0.126	0.053
Total newborns
Gestational age	0.361	< 0.001	0.133	0.003
Maternal age	0.029	0.519	−0.208	< 0.001
Body mass index before pregnancy	0.171	< 0.001	−0.103	0.022
Body weight gain during pregnancy	0.190	< 0.001	-
Fish/seafood intake	0.043	0.348	0.009	0.843
Total PCBs in cord blood^a,b	−0.207	< 0.001	−0.307	< 0.001
PCB-153 in cord blood^a,b	−0.209	< 0.001	−0.299	< 0.001
Total mercury in cord blood^b	−0.074	0.100	0.014	0.763
Lead in cord blood^b	−0.022	0.635	0.078	0.086

^aThese data were used following adjusting for the laboratory
^bAll biomarkers in cord blood and seafood intake were logarithmically transformed

ISSN: 1347-4715