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Table 4 Histological type by time interval since birth.

From: Histological type and grade of breast cancer tumors by parity, age at birth, and time since birth: a register-based study in Norway

  

Histological type (%)

 

No.

Duct

Lob

Muc

Tub

Med

Other

Unsp

Paget

Sarc

Years since first birth a

          

DP, < 2

83

86.7

1.2

0.0

0.0

2.4

0.0

7.2

0.0

2.4**

2-5

459

80.4

2.0(**)

1.1

0.2

1.1

1.1

11.8**

1.5

0.9

6-9

869

80.4

3.7

0.9

0.6

2.2**

1.0

9.1**

1.3

0.8

10-14

1789

81.6

4.8

1.0

0.5(*)

1.3

0.7

8.4**

1.3

0.4

15-19

2471

82.3

4.6

1.0

0.7

1.4

1.0

7.5

1.0

0.5

≥ 20

4038

83.7

5.3*

1.4

1.3**

1.1

0.8

4.7(**)

1.2

0.4

P-value b

<0.001

         

OR, unadj.c

 

-

1.1**

1.1

1.5**

0.89**

0.97

0.81**

0.97

0.81**

OR, adjust.c,d

 

-

0.91**

0.94

1.2

1.2**

0.94

0.84**

0.97

0.93

OR, adjust.c,e

 

-

0.93**

1.0

1.3

1.2

0.96

0.83**

0.94

0.93

Years since last birth f

          

DP, < 2

456

81.1

1.5(**)

0.7

0.0(**)

1.1

0.2

12.5

0.9

2.0**

2-5

1518

80.3

3.8

0.9

0.4(*)

2.0**

0.9

9.6**

1.7*

0.3

6-9

1654

81.6

4.2

1.0

0.8

1.5

1.0

8.2**

1.4

0.4

10-14

2336

82.7

5.2

1.0

0.9

1.1

0.8

7.1**

0.8(*)

0.4

15-19

2166

85.0

5.0

1.3

0.8

1.1

0.8

4.3(**)

1.2

0.4

≥ 20

1282

82.2

5.7*

1.5

1.4**

1.4

1.1

4.5(**)

1.3

0.7

P-value b

<0.001

         

OR, unadj.c

 

-

1.1**

1.1

1.3

0.92**

1.1

0.80**

0.95

0.91

OR, adjust.c,d

 

-

0.95**

1.0

1.1

1.2**

1.1

0.81**

0.92

1.1

OR, adjust.c,e

 

-

0.92**

0.96

1.1

1.3**

1.1

0.79**

0.93

1.1

  1. Histological types of breast cancer tumors by time interval since a childbirth
  2. a Results based on analyses of 9709 parous women diagnosed before age 50 years
  3. b Chi-square test for difference in proportions between groups, with significant cell-specific contributions to the chi-square statistic at 5% level marked with ** (Χ ≥ 1.96), and significant contributions at 10% level marked with * (Χ ≥ 1.64); in brackets if the observed number is lower than expected by chance
  4. c OR (each type vs. ductal tumors) for linear trend through ordered categories of exposure variable, significant trend (p < 0.05) marked with **
  5. d Adjusted for age at diagnosis
  6. e Adjusted for age at diagnosis and parity
  7. f Results based on analysis of 9412 of women diagnosed before age 50 years, with singleton births only (1st to 5th birth)
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