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Table 1 Summary characteristics at time of mammogram and by breast case status for the eight participating studies

From: Joint association of mammographic density adjusted for age and body mass index and polygenic risk score with breast cancer risk

Characteristic

Category

Cases

N = 3628

Controls

N = 5126

N

%

N

%

Study type

Population-based or cohort

2439

67.2

3895

76.0

 

Hospital-based

1189

32.8

1231

24.0

Age (years)

< 50

432

11.9

553

10.8

 

50–59

1150

31.7

1462

28.5

 

≥ 60

2046

56.4

3111

60.7

Parity

Nulliparous

431

12.1

582

11.5

 

Parous

3141

87.9

4459

88.5

 

Unknown

56

 

85

 

Menopausal status

Pre-menopausal

540

15.0

878

17.4

 

Post-menopausal

3058

85.0

4194

82.6

 

Unknown

30

 

54

 

Postmenopausal HT use in post-menopausal women

Ever

1737

59.6

2116

57.4

Never

1179

40.4

1568

42.6

Unknown

142

 

510

 

BMI (kg/m2)

< 25

1542

42.9

2095

41.3

 

≥ 25

2049

57.1

2982

58.7

 

Unknown

37

 

49

 

Family history breast cancer in first degree relatives

No

2808

81.5

3944

85.1

Yes

637

18.5

688

14.9

Unknown

183

 

494

 
  1. HT hormone therapy