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Table 3 Relations of prenatal biomarkers and confounders to birth weight: results of multiple regression analysisa

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

  252 Male newborns 237 Female newborns Total newborns
Standardized regression coefficient, β p value Standardized regression coefficient, β p value Standardized regression coefficient, β p value
Total PCBs in cord blood −0.171 0.004 −0.166 0.009 −0.161 < 0.001
Total mercury in cord blood −0.120 0.042 −0.042 0.499 −0.078 0.061
Lead in cord blood 0.023 0.692 −0.039 0.513 −0.011 0.784
Possible confounders
 Gestational age 0.397 < 0.001 0.373 < 0.001 0.383 < 0.001
 Parity 0.075 0.201 0.102 0.116 0.093 0.030
 Body mass index before pregnancy 0.143 0.012 0.227 < 0.001 0.180 < 0.001
 Smoking during pregnancy −0.066 0.237 0.080 0.185 0.006 0.889
 Drinking during pregnancy 0.001 0.986 0.019 0.756 0.010 0.812
 Fish/seafood intake 0.080 0.168 0.067 0.288 0.069 0.099
 Child sex - - - - 0.159 < 0.001
Contribution rate, R 2 0.229 < 0.001 0.204 < 0.001 0.239 < 0.001
  1. aTotal PCBs was used following adjusting for the laboratory, and all biomarkers in cord blood and fish/seafood intake were logarithmically transformed
  2. R indicates the multiple correlation coefficient