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Table 3 Variables selected for principal components analysis

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

No. Variables Factor Score Examination classification
1 Pigmentation of lower gingivae 0.735 Dental examination
2 Blood sugar (increase) 0.443 Laboratory examination
3 Abdominal pain 0.408 Questionnaire
4 Past history of pigmentation 0.498 Dermatological examination
5 Arthralgia 0.437 Questionnaire
6 Pigmentation of the upper lip (diffuse) 0.401 Dental examination
7 Triacylglycerol (increase) 0.361 Laboratory examination
8 Sputum 0.307 Questionnaire
9 Mean corpuscular volume (increase) 0.419 Laboratory examination
10 γ-GTP (increase) 0.367 Laboratory examination
11 Pigmentation of the upper lip (band-like) 0.581 Dental examination
12 albumin/globulin(A/G) ratio (decrease) -0.471 Laboratory examination
13 General fatigue -0.327 Questionnaire
14 Pigmentation (toe nails) 0.447 Dermatological examination
15 Tooth pigmentation 0.336 Dental examination
16 Pigmentation of the palatal mucosa 0.204 Dental examination
17 Pigmentation of the right buccal mucosa (band-like) 0.339 Dental examination
18 Past history (after the incident) 0.241 Questionnaire
19 Dental chief complaint 0.389 Dental examination
20 Nail deformity -0.272 Dermatological examination
21 Numbness 0.208 Questionnaire
22 Pigmentation (face) 0.280 Dermatological examination
23 Abnormal discharge from the eyes -0.297 Ophthalmological examination
24 Abnormal respiratory sounds 0.295 Physical examination
25 Pigmentation (left. buccal mucosa) 0.266 Dental examination
26 Total cholesterol (increase) 0.246 Laboratory examination
27 Cough 0.192 Questionnaire
28 Past history (Before the incident) 0.246 Questionnaire
29 Acneform eruptions (other sites) 0.297 Dermatological examination
30 Mucosal pigmentation of upper gingivae (linear) 0.363 Dental examination
31 Cheesy secretion from meibomian glands -0.260 Ophthalmological examination
32 Presence of hepatomegaly -0.317 Questionnaire
33 Direct-bilirubin (increase) 0.225 Laboratory examination
34 Abnormal heart sounds 0.239 Questionnaire
35 potassium level 0.286 Laboratory examination
36 Acneform eruptions (trunk) 0.216 Dermatological examination
37 Pigmentation (fingernails) 0.231 Dermatological examination
38 Malocclusion 0.274 Dental examination
39 Black comedones (other sites) -0.323 Dermatological examination
40 Urinalysis protein 0.363 Laboratory examination
41 Systolic blood pressure (low) -0.294 Questionnaire
42 Toothache 0.311 Dental examination
43 Edema of the eyelids 0.305 Ophthalmological examination
44 Headache 0.188 Questionnaire
45 Chief complaint -0.224 Questionnaire
46 Pigmentation of the mucosa of the upper lip (spotted) 0.292 Dental examination
47 Black comedones (face) 0.240 Dermatological examination
48 Total bilirubin (increase) 0.225 Laboratory examination
49 Past history of acneform eruptions 0.248 Dermatological examination