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Table 1 Characteristics of Polish Breast Cancer Study participants (n = 4,194)

From: Genetic variation in PRL and PRLR, and relationships with serum prolactin levels and breast cancer risk: results from a population-based case-control study in Poland

Characteristic

Case

Control

P valuea

 

Number

Percentage

Number

Percentage

 

Age

     

   Less than 40 years

80

4

92

4

 

   40-49 years

501

26

554

25

 

   50-59 years

668

34

759

34

 

   60-69 years

508

26

588

26

 

   At least 70 years

208

11

236

11

 

Menopausal status

     

   Premenopausal

521

27

686

31

<0.01

   Postmenopausal

1,444

73

1,543

69

 

Parity

     

   Nulliparous

283

14

248

11

<0.01

   Parous

1,682

86

1,981

89

 

Breastfeedingb

     

   0 months

353

21

368

19

0.03

   Less than 12 months

939

56

1,078

54

 

   12 to 23 months

255

15

336

17

 

   At least 24 months

135

8

199

10

 

Age at menarche

     

   Not more than 12 years

562

29

497

23

<0.01

   13 years

427

22

516

23

 

   14 years

520

27

615

28

 

   15 years

208

11

253

11

 

   At least 16 years

233

12

322

15

 

Body mass index

     

   Less than 25 kg/m2

732

37

705

32

<0.01

   25 to less than 30 kg/m2

696

35

812

36

 

   At least 30 kg/m2

535

27

709

32

 

Oral HT usec

     

   Never

1,106

82

1,284

88

<0.01

   Current

120

9

68

5

 

   Recent

64

5

25

2

 

   Past

62

5

83

6

 

Alcohol drinks per week

     

   Never drinker

1,254

65

1,464

67

0.11

   0 to less than 1

184

10

206

9

 

   1 to less than 3

282

15

289

13

 

   3 to less than 5

71

4

97

4

 

   At least 5

137

7

121

6

 

Family history of breast cancerd

     

   No

1,766

90

2,101

94

<0.01

   Yes

198

10

128

6

 
  1. aPearson chi-square test P value. bParous women only. cHT, hormone therapy, postmenopausal women only. dMother, sister, daughter, excludes half-sisters.