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Table 3 Multiple regressions of the combined study groups

From: Dioxin-like activities in serum across European and Inuit populations

Response variable Homogeneity of slope (p value) Common slope, Estimate (SE), p value Common intercept (p value) Adjusted R square
AhRag (n = 327)     
CB-153 0.95 -0.03 (0.04), 0.43 0.001 0.05
p,p'-DDE 0.28 -0.02 (0.05), 0.70 0.001 0.05
AhR-TEQ (n = 324)     
CB-153 0.54 0.11(0.04), 0.77 < 0.001 0.20
p,p'-DDE 0.99 0.08(0.05), 0.07 < 0.001 0.20
AhRcomp (n = 327)     
CB-153 0.01 -* -* -*
p,p'-DDE 0.80 -0.03 (0.03), 0.24 < 0.001 0.18
  1. Both AhR activities and POP markers are ln transformed. Homogeneity of slope: test for homogeneity of association between exposure variables and outcome variables across the study group (p > 0.05, accept the hypotheses of homogeneity of slope). Common slope: the estimated common slope across study groups assuming homogeneity (p > 0.05, accept the hypotheses that slope equals to zero). Common intercept: test of a common intercept across study groups assuming a common slope (p > 0.05, accept the hypotheses having common intercept across the study groups). Adjusted R square assumes a common slope. *: Since heterogeneity of slope exists between CB-153 and AhRcomp across the study groups, i.e. there were country differences in the association of CB-153 and AhRcomp, no further evaluation was performed.