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Table 3 Histological type by parity and age at first 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

Parity

          

0

3251

80.4

5.8

2.0**

1.1

1.1

1.0

6.7**

1.3

0.6*

≥ 1

19616

81.6

6.4

1.4

1.1

1.1

1.2

5.3

1.5

0.4

P-value*

0.004

         

Parous

          

1

3493

81.3

5.8

2.0**

1.4

0.8

1.3

5.7

1.3

0.4

2

8624

81.5

6.9

1.3

1.1

1.2

1.1

5.2

1.3

0.4

3

5123

81.9

6.2

1.5

1.1

1.1

1.1

5.3

1.4

0.3

≥ 4

2376

81.6

6.3

1.1

0.8

1.3

1.4

4.7

2.4**

0.3

P-value a

0.007

         

OR, unadj.b

 

-

1.0

0.87**

0.88**

1.1

1.0

0.95**

1.2**

0.88

OR, adjust.b , c

 

-

1.0

0.84**

0.82**

1.1

1.0

1.0

1.2**

0.90

Age at first birth (yr) d

          

<20

2199

83.0

5.1(**)

1.3

1.2

1.7**

1.0

4.7

1.4

0.5

20 - 24

8610

82.0

6.2

1.4

1.2

1.1

1.2

5.1

1.4

0.4

25 - 29

6021

80.9

6.5

1.5

1.1

0.9

1.2

5.9**

1.6

0.4**

≥ 30

2782

80.4

7.9**

1.6

0.9

1.0

1.3

5.0

1.5

0.4

P-value a

0.007

         

OR, unadj.b

 

-

1.1**

1.1

0.92

0.82**

1.1

1.1

1.2

0.97

OR, adjust.b,c

 

-

1.1**

0.98

0.84**

0.87**

1.1

1.1**

1.1

0.98

  1. Histological types of breast cancer tumors by parity and maternal age at first birth
  2. a 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
  3. b OR (each type vs. ductal tumors) for linear trend through ordered categories of exposure variable, significant trend (p < 0.05) marked with **
  4. c Adjusted for age at diagnosis, age at first birth/parity
  5. d Parous women only; four women excluded due to invalid value for age at first birth