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Table 4 Adjustments for postnatal exposure to PCBs, PCDD/Fs and PBDEs using a multiple linear regression

From: Association between levels of persistent organic pollutants in adipose tissue and cryptorchidism in early childhood: a case–control study

   Sum of PCDD/Fs Sum of PCBs Sum of PBDEs Total-TEq
Countrya β (95 % CI)b 0.61 (0.43–0.87) 1.20 (0.79–1.81) 0.53 (0.33–0.83) 1.13 (0.81–1.57)
p 0.006 0.38 0.007 0.46
R2 0.08 <0.01 0.10 <0.01
Duration of breastfeedinga β (95 % CI)c 1.08 (1.05–1.12) 1.16 (1.12–1.21) 1.01 (0.97–1.05) 1.13 (1.10–1.17)
p <0.001 <0.001 0.70 <0.001
R2 0.27 0.44 0.05 0.48
Age at the operationa β (95 % CI)d 1.00 (0.99–1.01) 1.00 (0.99–1.01) 1.01 (1.00–1.02) 1.00 (0.99–1.00)
p 0.73 0.83 0.27 0.27
R2 <0.01 <0.01 0.02 <0.01
  1. aAltogether 40 cases and 33 controls. bRegression coefficients for the ratio of mean chemical concentrations in Danish versus Finnish subjects, adjusted for duration of breastfeeding and age at the operation. cRegression coefficients for the relative increase in adjusted chemical concentrations per month of breastfeeding, adjusted for country of origin and age at operation. dRegression coefficients for the relative increase in chemical concentrations per month of age at operation, adjusted for country of origin and duration of breastfeeding