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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