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Table 1 Participant characteristics by case, control, and combined grouping.

From: Comparison of percent density from raw and processed full-field digital mammography data

Characteristic

Case n

Case

Mean/SDb

or %

Control n

Control

Mean/SDb

or %

Total n

Total

Mean/SDb

or %

P d

Age

180

58.60/10.46

180

58.53/10.40

360

58.56/10.41

0.232

Menopausal Status

      

0.049

Postmenopausal

142

78.89%

132

73.33%

274

76.11%

 

Premenopausal

38

21.11%

48

26.67%

86

23.89%

 

PMHa

      

0.297

Never-used

96

53.33%

101

56.11%

197

54.72%

 

1 - 5 yrs

30

16.67%

27

15.00%

57

15.83%

 

6 - 10 yrs

18

10.00%

19

10.56%

37

10.28%

 

11 - 15 yrs

13

7.22%

9

5.00%

22

6.11%

 

> 15 yrs

23

12.78%

24

13.33%

47

13.06%

 

BMI (kg/m2)c

179

26.56/4.62

180

25.25/4.25

359

25.90/4.48

0.009

Breast area (cm2)

180

139.01/47.83

180

131.52/40.60

360

135.26/44.46

0.104

PDproc (%)

180

22.48/14.41

180

19.76/12.89

360

21.12/13.72

0.029

PDraw (%)

180

21.33/15.66

180

17.70/14.58

360

19.52/15.22

0.009

  1. aPostmenopausal hormonal (PMH) by years (yrs); bthe mean and standard deviation (SD) for the raw and processed (proc) percentage of breast density measures (PD), age (years), body mass index (BMI kg/m2) and breast area (cm2) are also provided; cBMI was missing for one case observation; dP values (P) were determined with the paired t test (continuous variables) or the exact McNemar's test (binary variables) by comparing the respective case and control quantities.