Table 4 Adjusted linear regression coefficients and 95% confidence intervals for the associations between tertiles of PFAS (ng/mL) and PBDE (ng/g lipid) concentrations > 80% detection in maternal serum and gestational age in weeks and birth weight z-scores (N = 506)

   < 1.40

167

  1.40–0.96

172

(−0.74, 0.17)

(−0.10, 0.35)

   > 0.96

167

(−0.63, 0.43)

(−0.14, 0.37)

   < 1.40

167

  1.40–2.56

172

(−0.64, 0.26)

(− 0.24, 0.22)

   > 2.56

167

(− 0.59, 0.43)

(− 0.23, 0.27)

   < 0.24

163

  0.24–0.49

176

(−0.18, 0.73)

(−0.15, 0.32)

   > 0.49

167

(−0.47, 0.65)

(−0.12, 0.42)

   < 0.24

171

  0.24–0.49

244

(−0.71, 0.14)

(−0.20, 0.23)

   > 0.49

91

(−0.88, 0.28)

(− 0.32, 0.25)

   < 0.04

165

  0.04–0.06

171

(−0.32, 0.57)

(− 0.46, − 0.02)

   > 0.06

170

(−0.27, 0.63)

(−0.14, 0.32)

   < 2.62

169

  2.62–4.83

171

(−0.80, 0.12)

(−0.22, 0.24)

   > 4.83

166

(−0.72, 0.30)

(−0.19, 0.31)

   < 8.47

167

  8.47–14.22

172

(−0.50, 0.35)

(− 0.48, − 0.04)

   > 14.22

167

(− 0.95, − 0.02)

(− 0.37, 0.09)

   < 2.88

169

  2.88–4.71

170

(−0.35, 0.49)

(− 0.47, − 0.04)

   > 4.71

167

(− 0.71, 0.22)

(− 0.31, 0.15)

   < 11.38

171

  11.38–18.99

170

(− 0.55, 0.29)

(− 0.48, − 0.04)

   > 18.99

165

(− 0.87, 0.05)

(− 0.32, 0.14)