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Table 1 Characteristics of breast cancer cases by ethnic group

From: Mammographic density as a predictor of breast cancer survival: the Multiethnic Cohort

Characteristic

Native Hawaiian

Japanese

Caucasian

Other

All

Number of cases

79

292

195

41

607

Number of deaths

20

51

54

2

127

   Breast cancer

7

10

9

1

27

   All other causes

13

41

45

1

100

Stage at diagnosis, number

     

   In situ

10

68

38

9

125

   Local

50

175

131

24

380

   Advanced

19

48

25

8

100

   Unknown

0

1

1

0

2

Number of second breast cancers

12

29

25

5

71

Mean age at mammograms, years

57.8

60.2

60.4

55.5

59.6

Age at diagnosis, years

61.7

63.9

63.9

59.3

63.3

Time from first mammogram to diagnosis, yearsa

6.3

6.7

6.7

6.4

6.3

Years of follow-up

12.4

13.2

12.6

13.8

12.9

Total breast area, cm2

139.4

92.0

136.7

98.0

112.9

Dense breast area, cm2

37.7

32.0

41.6

41.4

36.5

Percent density

30.1

38.2

36.2

45.1

37.0

Body mass index, kg/m2

28.2

24.3

25.2

24.4

25.1

Family history, percentageb

25.3

16.1

14.9

19.5

17.1

Age at menarche, years

12.9

12.9

13.0

13.8

13.0

Parous, percentage

87.3

84.3

82.1

80.5

83.7

At least 30 years old at first birth, percentage

3.8

10.3

8.7

14.6

9.2

Number of children

3.1

2.2

2.2

2.3

2.3

Postmenopausal, percentage

80.0

79.5

85.1

63.4

79.7

   Use of any HRT, percentagec

48.1

24.3

34.9

31.7

31.3

   ERT use, percentage

24.1

44.5

38.0

19.5

38.1

   EPRT use, percentage

27.9

31.2

27.2

48.8

30.6

  1. Values are presented as means unless indicated otherwise. aNumber of years from the earliest scanned mammogram to the diagnosis of breast cancer. bWomen who have first-degree relatives with breast cancer. cPostmenopausal women are the denominator for the hormone replacement therapy (HRT) use. EPRT, combined estrogen-progestin replacement therapy; ERT, estrogen-only replacement therapy.