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Table 4 Results of logistic regression analysis(2,3,4,7,8-PeCDF blood level as an objective variable)

From: Association of clinical findings in Yusho patients with serum concentrations of polychlorinated biphenyls, polychlorinated quarterphenyls and 2,3,4,7,8-pentachlorodibenzofuran more than 30 years after the poisoning event

List of explanatory variables which showed less than 0.10 level of significance when 2,3,4,7,8-PeCDF blood level (2 categories) and the factors selected by the principal components analysis were used as objective variables and explanatory variables, respectively
  Explanatory variables β Standard deviation Wald Significance probability Exp (B)
1 PCB blood level 1.641 0.355 21.350 0.00000** 5.159
2 PCQ blood level 8.235 1.844 19.949 0.00001** 3771.361
3 Blood sugar (increase) 0.038 0.011 11.310 0.00077** 1.038
4 Arthralgia 3.734 1.159 10.382 0.00127** 41.857
5 Gender (female) 3.456 1.115 9.605 0.00194** 31.679
6 T-bilirubin (increase) -3.310 1.194 7.681 0.00558** 0.037
7 Black comedones (face) -2.216 0.836 7.021 0.00806** 0.109
8 Past history of skin pigmentation 3.576 1.435 6.209 0.01271** 35.735
9 A/G ratio (decrease) 1.978 0.825 5.748 0.01651** 7.225
10 Acneform eruptions (trunk) 3.809 1.650 5.331 0.02095** 45.088
11 Respiratory sounds (abnormal) 6.036 2.780 4.714 0.02991** 418.145
12 Acneform eruptions (other sites) -5.514 2.721 4.107 0.04270** 0.004
13 Potassium level (increase) -1.849 0.917 4.071 0.04361** 0.157
14 Past history of acneform eruptions -2.630 1.304 4.065 0.04378** 0.072
15 Total cholesterol (increase) -0.023 0.011 3.910 0.04799** 0.978
16 Heart sound (abnormal) 13.341 7.892 2.857 0.09096* 621883.792
List of explanatory variables which showed less than 0.10 level of significance when PCB and PCQ blood levels were excluded from the explanatory variables in the above analysis
  Explanatory variables β Standard deviation Wald Significance probability Exp (B)
1 Past history of pigmentation 1.719 0.445 14.943 0.00011** 5.582
2 Age (old) 0.053 0.014 13.637 0.00022** 1.055
3 A/G ratio (decrease) 0.723 0.336 4.646 0.03113** 2.061
4 General fatigue -0.652 0.304 4.593 0.03211** 0.521
5 Arthralgia 0.633 0.299 4.478 0.03433** 1.884
6 Gender (female) 0.615 0.334 3.390 0.06558* 1.850
7 Pigmentation of the right buccal mucosa (band-like) 2.596 1.422 3.332 0.06793* 13.416
  1. * P < 0.10, ** P < 0.05