Table 1 Patient demographics and clinical characteristics

  < 60 years

48.6

52.6

47.9

48.1

55.3

47.6

  > 60 years

51.4

47.4

52.1

51.9

44.7

52.4

 Central portion

1.6

0.9

0.5

1.7

1.1

0.7

  Upper outer quadrant

40.8

41.7

37.8

39.1

37.1

38.8

  Upper inner quadrant

17.4

18.9

20.5

20.7

19.2

20.1

  Lower outer quadrant

27.2

24.8

28.1

27.1

25.9

26.7

  Lower inner quadrant

13.0

13.7

13.5

11.4

16.7

13.7

  T1 (< 2 cm)

47.7

56.1

52.7

51.8

50.5

51.2

  T2 (2-5cm)

52.3

43.9

47.3

48.2

49.5

48.8

  Invasive ductal carcinoma

66.7

61.7

63.1

57.2

60.9

62.6

  Invasive lobular carcinoma

22.3

24.6

27.2

27.7

26.8

26.6

  Tubular carcinoma

11.0

13.7

9.7

15.1

12.3

10.8