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Table 5 Results of logistic regression analysis (PCB 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

Explanatory variables that showed less than 0.10 level of significance when the PCB blood level (2 categories) and 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 2,3,4,7,8-PeCDF blood level 0.012 0.003 15.412 0.00009** 1.012
2 Sputum -2.818 0.855 10.876 0.00097** 0.060
3 Age (old) 0.129 0.039 10.834 0.00100** 1.137
4 Past history of pigmentation -3.832 1.167 10.783 0.00102** 0.022
5 Gender (female) -1.986 0.693 8.220 0.00414** 0.137
6 Past history of acneform eruptions 2.785 1.023 7.409 0.00649** 16.202
7 Pigmentation (toe nails) -1.907 0.750 6.472 0.01096** 0.149
8 Hepatomegaly -7.627 3.134 5.920 0.01497** 0.000
9 Headache -1.554 0.704 4.871 0.02732** 0.211
10 Cheesy secretion from meibomian glands 2.623 1.248 4.414 0.03564** 13.773
11 Total bilirubin (increase) -1.611 0.770 4.372 0.03654** 0.200
12 General fatigue 1.374 0.676 4.138 0.04194** 3.951
Explanatory variables which showed less than 0.10 level of significance when 2,3,4,7,8-PeCDF blood level was excluded from the explanatory variables in the above analysis
  Explanatory variables β Standard deviation Wald Significance probability Exp (B)
1 Age (old) 0.115 0.033 11.920 0.00056** 1.121
2 Sputum -2.040 0.663 9.473 0.00208** 0.130
3 Past history of pigmentation -2.432 0.958 6.440 0.01116** 0.088
4 Total bilirubin (decrease) -1.701 0.686 6.145 0.01318** 0.182
5 PCQ blood level 1.142 0.480 5.654 0.01742** 3.134
6 Pigmentation (toe nails) -1.418 0.621 5.213 0.02242** 0.242
7 Arthralgia -4.886 2.357 4.299 0.03814** 0.008
8 Presence of a chief dental complaint 1.544 0.748 4.263 0.03896** 4.682
9 Headache -1.276 0.624 4.179 0.04093** 0.279
10 Cheesy secretion from meibomian glands 2.616 1.291 4.110 0.04264** 13.682
11 Past history of acneform eruptions 1.650 0.853 3.743 0.05304* 5.205
12 Black comedones -3.569 2.086 2.926 0.08716* 0.028
13 Mean corpuscular volume (increase) -0.080 0.047 2.847 0.09154* 0.923
14 Urinalysis protein (increase) -0.619 0.372 2.771 0.09600* 0.539
  1. * P < 0.10, ** P < 0.05