Table 1

Women included in the study, descriptive statistics

all non-cancer (%)

cluster 1 (%)

cluster 2 (%)

p-value (cluster 1 vs 2)


Age

mean

50.2

49.3

49.8.4

0.87 1)

<40

14 (18)

3 (25)

11 (16)

40-49

17 (22)

2 (17)

15 (22)

50-69

43 (54)

6 (50)

37 (55)

70+

2 (3)

1 (8)

1 (1)

missing

3 (4)

0 (0)

3 (4)


Parity

0

10 (13)

4 (33)

6 (9)

0.052)

1+

65 (82)

8 (67)

57 (85)

missing

4 (5)

0 (0)

4 (6)


Age at first birth

mean

24.4

24

24.6

0.75 1)

no children

10 (13)

4 (33)

6 (9)

<25

30 (38)

4 (33)

26 (39)

25-34

24 (30)

3 (25)

21 (31)

35+

2 (3)

0 (0)

2 (3)

missing

13 (16)

1 (8)

12 (18)


Hormone therapy use

never

55 (70)

8 (67)

47 (70)

0.72 2)

current

11 (14)

2 (17)

9 (13)

past

6 (8)

0 (0)

6 (9)

missing

7 (9)

2 (17)

5 (7)


Body mass index

mean

24

23

24.5

0.24 1)

<20

5 (6)

2 (17)

3 (4)

20-<25

44 (56)

6 (50)

38 (57)

25-<30

21 (27)

4 (33)

17 (25)

30+

6 (8)

0 (0)

6 (9)

missing

3 (4)

0 (0)

3 (4)


Mammographic density

mean

39.6

36.7

37

0.62 1)

0-<23

19 (24)

2 (17)

17 (25)

23-<37

21 (27)

4 (33)

17 (25)

37-<52

19 ((24)

3 (25)

16 (24)

52+

17 (22)

3 (25)

14 (21)

missing

3 (4)

0 (0)

3 (4)


Referral source

risk/lump

32 (41)

9(75)

23 (33)

0.0072)

screening

28 (36)

0 (0)

28 (42)

unknown

19 (24)

3 (25)

16 (24)


1) Two-sided t-test for continuous variables

2) Fisher exact test for categorical variables with <5 observations in certain cells

Haakensen et al. BMC Medical Genomics 2011 4:77   doi:10.1186/1755-8794-4-77

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