Table 2 Distribution of background, tumor characteristics, and recent mammography in relation to use of menopausal hormone therapy

Total

1,788

253

523

96

Age at diagnosis

   50 to 54 years

154 (9)

23 (9)

148 (28)

20

   55 to 59 years

320 (18)

45 (18)

181 (35)

32

   60 to 64 years

381 (21)

54 (21)

116 (22)

19

   65 to 69 years

521 (29)

70 (28)

55 (11)

15

   70 to 74 years

412 (23)

61 (24)

23 (4)

10

   P value^a

0.99

<0.0001

Socioeconomic status^b

   Low

961 (54)

120 (47)

197 (38)

57

   High

811 (46)

133 (53)

325 (62)

39

   Missing

16

0

1

0

   P value^a

0.042

<0.0001

Recent mammography

   Yes

933 (59)

147 (64)

361 (73)

61

   No

650 (41)

83 (36)

133 (27)

29

   Missing

205

23

29

6

   P value^a

0.15

<0.0001

Tumor size

   ≤ 10 mm

488 (28)

59 (24)

151 (29)

30

   11 to 20 mm

759 (43)

115 (46)

240 (46)

39

   21 to 50 mm

471 (27)

72 (29)

120 (23)

26

   >50 mm

56 (3)

3 (1)

10 (2)

1

   Missing

14

4

2

0

   P value^a

0.17

0.15

Lymph node involvement

   0 lymph nodes

1,164 (68)

164 (67)

353 (69)

69

   1 to 3 lymph nodes

362 (21)

53 (22)

113 (22)

18

   >3 lymph nodes

187 (11)

29 (12)

46 (9)

7

   Missing

75

7

11

2

   P value^a

0.90

0.44

Mean number of examined lymph nodes

10.4

10.8

10.7

Grade

   1

164 (14)

17 (10)

78 (23)

13

   2

524 (43)

65 (40)

133 (39)

20

   3

520 (43)

81 (50)

130 (38)

33

   Missing

580

90

182

30

   P value^a

0.23

0.0002

Histology

   Ductal

1,314 (74)

180 (72)

338 (66)

69

   Lobular

186 (11)

31 (12)

81 (16)

11

   Other

269 (15)

38 (15)

93 (18)

15

   Missing

19

4

11

1

   P value^a

0.64

0.0004

Estrogen receptor (ER), progesterone receptor (PR) status

   ER^-PR^-

227 (18)

37 (19)

55 (15)

17

   ER⁺PR^-

200 (16)

32 (17)

40 (11)

14

   ER^-PR⁺

42 (3)

5 (3)

23 (6)

2

   ER⁺PR⁺

776 (62)

116 (61)

240 (67)

40

   Missing

543

63

165

23

   P value^a

0.91

0.0044