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Table 1 Demographic and risk factor distributionsa of the Mayo Mammography Health Study cohort (2003 to 2006)

From: The influence of mammogram acquisition on the mammographic density and breast cancer association in the mayo mammography health study cohort

 

Analysis groups

 
 

Cases, Mean or N (SD/%)b

Subcohort, Mean or N (SD/%)

Eligible cohort, Mean or N (SD/%)

Number

318

2,259

19,865c

Age, years

61.8 (11.2)

58.0 (12.2)

58.0 (12.2)

Body mass index, kg/m2

28.9 (6.9)

28.1 (6.5)

28.2 (6.4)

Post-menopausal hormone use

   

   Current

61 (19.2%)

445 (19.4%)

3,554 (17.9%)

   Former

85 (26.7%)

505 (22.0%)

4,561 (23.0%)

   Never

148 (46.5%)

1,143 (49.7%)

9,986 (50.3%)

   Unknown

24 (7.6%)

205 (8.9%)

1,764 (8.9%)

Post-menopausal

252 (79.3%)

1,592 (69.3%)

13,627 (68.6%)

Imaging parameters

   

   Number

254

1,910

 

   Percent density

19.1 (13.7)

17.6 (14.1)

 

   Dense area, mm2

2,622 (1,939)

2,333 (1,841)

 

   Non-dense area, mm2

13,232 (6,702)

13,460 (7,198)

 

   Milliampere-seconds

161.0 (49.4)

157.9 (49.5)

 

   X-ray tube voltage peak, kVp

26.2 (1.7)

26.1 (1.5)

 

   Thickness, mm

53.9 (13.3)

53.2 (12.7)

 

   Compression force, pounds

24.7 (6.1)

24.9 (5.6)

 
  1. aReported at enrollment; b39 women overlap between cases and subcohort; c59 women were deleted for breast cancers occurring within the first two months after enrollment. They are included in the full cohort but excluded from analyses in this paper. SD, standard deviation.