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Table 4 Multivariable regression model of iron metabolism gene variants, log-transformed maternal blood lead, and their interaction on log-transformed umbilical cord blood lead ( n = 476) a,b,c

From: Maternal iron metabolism gene variants modify umbilical cord blood lead levels by gene-environment interaction: a birth cohort study

Predictor

β

95% CI

P-value

Constant

−0.17

−0.21, −0.13

<0.01

Maternal Blood Lead (MBL)

0.92

0.82, 1.03

<0.01

Maternal TF P570S

0.04

−0.03, 0.11

0.28

  MBL × Maternal TF P570S

−0.13

−0.35, 0.09

0.24

Maternal HFE H63D

−0.07

−0.14, 0.01

0.08

  MBL × Maternal HFE H63D

−0.12

−0.34, 0.11

0.32

Maternal HFE C282Y

−0.002

−0.09, 0.09

0.97

  MBL × Maternal HFE C282Y

−0.27

−0.52, −0.01

0.04

Infant TF P570S

−0.06

−0.13, 0.003

0.06

  MBL × Infant TF P570S

−0.03

−0.24, 0.18

0.81

Infant HFE H63D

0.01

−0.06, 0.08

0.77

  MBL × Infant HFE H63D

0.10

−0.11, 0.32

0.34

Infant HFE C282Y

−0.02

−0.11, 0.07

0.65

  MBL × Infant HFE C282Y

−0.05

−0.28, 0.17

0.64

  1. aBlood lead concentrations are log-transformed, beta coefficients are therefore interpreted as percent change in umbilical cord blood lead for a 1% change in maternal blood lead; bCollinearity diagnostics indicate a maximum variance inflation factor of 3.4; cR2 for the model equals 0.53 and adjusted R2 equals 0.52; dbolded values are statistically significant at α = 0.05.