Table 1

Distribution of demographic, reproductive, and lifestyle risk factors by race/ethnicity in the combined LACE and Pathways Studies (n = 2544)

White Total n = 1943 n (%)

African American Total n = 155 n (%)

Asian Total n = 189 n (%)

Hispanic Total n = 197 n (%)

Other Total n = 54 n (%)

P valuea


Age at diagnosis (years)

< 0.0001

< 50

389 (20.0)

43 (27.7)

61 (32.3)

67 (34.0)

13 (24.1)

50 to 64

879 (45.2)

80 (51.6)

87 (46.0)

80 (40.6)

29 (53.7)

≥ 65

675 (34.7)

32 (20.6)

41 (21.7)

50 (25.4)

12 (22.2)

mean (± standard deviation)

59.8 (11.2)

56.2 (10.7)

54.8 (11.0)

55.7 (12.4)

57.7 (9.8)

Menopausal status

< 0.0001

Postmenopausal

1,330 (75.6)

90 (71.4)

104 (59.1)

117 (65.4)

35 (72.9)

Premenopausal

430 (24.4)

36 (28.6)

72 (40.9)

62 (34.6)

13 (27.1)

Family history

0.001

No

1,503 (77.4)

133 (85.8)

163 (86.2)

167 (84.8)

41 (75.9)

Yes

440 (22.6)

22 (14.2)

26 (13.8)

30 (15.2)

13 (24.1)

Parity

0.006

Nulliparous

343 (17.7)

22 (14.2)

46 (24.3)

31 (15.7)

9 (16.7)

1 to 2 children

894 (46.0)

67 (43.2)

93 (49.2)

79 (40.1)

31 (57.4)

≥ 3 children

706 (36.3)

66 (42.6)

50 (26.5)

87 (44.2)

14 (25.9)

Age at first full-term pregnancy (years)

< 0.0001

Nulliparous

343 (17.7)

22 (14.3)

46 (24.3)

31 (15.8)

9 (16.7)

< 26

1,020 (52.6)

113 (73.4)

61 (32.3)

119 (60.7)

28 (51.9)

≥ 26

578 (29.8)

19 (12.3)

82 (43.4)

46 (23.5)

17 (31.5)

Lifetime duration of lactation

0.215

Never

908 (47.3)

92 (59.7)

81 (44.3)

91 (48.1)

25 (47.2)

0 to 3 months

279 (14.5)

19 (12.3)

31 (16.9)

25 (13.2)

8 (15.1)

≥ 4 months

733 (38.2)

43 (27.9)

71 (38.8)

73 (38.6)

20 (37.7)

Alcohol use

< 0.0001

Never

675 (39.9)

77 (67.5)

116 (75.3)

93 (62.4)

28 (57.1)

Ever

1,016 (60.1)

37 (32.5)

38 (24.7)

56 (37.6)

21 (42.9)

Smoking history (years)

< 0.0001

Never

925 (48.0)

73 (47.4)

148 (78.3)

113 (57.4)

22 (40.7)

≤ 10

269 (14.0)

17 (11.0)

13 (6.9)

33 (16.8)

6 (11.1)

11 to 19

169 (8.8)

10 (6.5)

8 (4.2)

6 (3.0)

5 (9.3)

≥ 20

563 (29.2)

54 (35.1)

20 (10.6)

45 (22.8)

21 (38.9)

Hormone replacement therapy (postmenopausal women only)

Never

310 (23.8)

37 (42.1)

47 (45.6)

37 (32.2)

12 (34.3)

Ever

994 (76.2)

51 (57.9)

56 (54.4)

78 (67.8)

23 (65.7)

Oral contraceptive use

< 0.0001

Never

638 (33.8)

40 (26.7)

100 (55.9)

72 (37.7)

16 (30.2)

Ever

1,252 (66.2)

110 (73.3)

79 (44.1)

119 (62.3)

37 (69.8)

Body mass index (kg/m2)b

< 0.0001

< 25

835 (43.4)

31 (20.0)

119 (63.3)

63 (32.5)

20 (37.0)

25 to 29

600 (31.1)

48 (31.0)

46 (24.5)

64 (33.0)

14 (25.9)

≥ 30

491 (25.5)

76 (49.0)

23 (12.2)

67 (34.5)

20 (37.0)


a From Pearson chi-square test across racial/ethnic categories.

b Body mass index one year pre-diagnosis (LACE) and around diagnosis (Pathways).

Kwan et al. Breast Cancer Research 2009 11:R31   doi:10.1186/bcr2261

Open Data