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Table 1 Baseline Characteristics of Participants According to Combined Potential EDC Substance Groups: The Singapore Chinese Health Study

From: Occupational exposure to endocrine disrupting substances and the risk of breast Cancer: the Singapore Chinese health study

 

No Exposure to Substance, Industry & Job (N = 18,138)

No Substance Reported (N = 11,524)

Tertile 1 (N = 1023)

Tertile 2 (N = 1631)

Tertile 3 (N = 1142)

Mean

± SD

Mean

± SD

Mean

± SD

Mean

± SD

Mean

± SD

Covariates

 Age at baseline

57

8.2

55

7.7

54

7.3

55

7.4

56

7.9

 BMI

23

3.2

23

3.4

23

3.5

23

3.7

23

3.47

 

N

(%)

N

(%)

N

(%)

N

(%)

N

(%)

Education

 No formal Education

7379

40.7

4577

39.7

318

31.1

640

39.2

495

43.4

 Primary/Secondary

9929

54.7

6872

59.6

694

67.8

974

59.7

628

55.0

 Beyond Secondary

830

4.6

75

0.7

11

1.1

17

1.0

19

1.7

Dialect

 Hokkiens

10,378

57.2

5335

46.3

477

46.6

711

43.6

505

44.2

Alcohol Consumption

 Never drinker

16,777

92.5

10,338

89.7

906

88.6

1426

87.4

998

87.4

Smoking status

 Never

16,677

92.0

10,510

91.2

926

90.5

1452

89.0

999

87.5

Menopause Status

 Menopausal

13,457

74.2

7988

69.3

643

62.9

1113

68.2

812

71.1

Age at Menarche

  < =14 years of age

9575

52.8

6073

52.7

589

57.6

851

52.2

562

49.2

 15–16 years of age

6283

34.6

3982

34.6

328

32.1

548

33.6

401

35.1

  > = 17 years of age

2280

12.6

1469

12.8

106

10.4

232

14.2

179

15.7

Parity

 At least 1 child birth

16,917

93.3

10,662

92.5

964

94.2

1532

93.9

1016

89.0

Age at First Birth

  < =20 years of Age

5010

27.6

2848

24.7

238

23.3

392

24.0

337

29.5

 21–30 years of age

11,495

63.4

7390

64.1

686

67.1

1063

65.2

671

58.8

  > = 31 years of age

1633

9.0

1286

11.2

99

9.7

176

10.8

134

11.7

Birth Control Use

 Never

13,814

76.2

8194

71.1

624

61.0

1134

69.5

832

72.9

Ever Hormone Use

 Never Estrogen

17,151

94.6

10,941

94.9

949

92.8

1520

93.2

1052

92.1

 Never Progesterone

17,865

98.5

11,354

98.5

1004

98.1

1608

98.6

1111

97.3