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Table 1 Associations between quintiles (Q1-Q5) of the mammographic measures and breast cancer risk

From: Using mammographic density to predict breast cancer risk: dense area or percentage dense area

      

Adjusted for Dense Area

Measurement

Cases (n)

Controls (n)

ORb

95% CIc

P value

OR

95% CI

P value

Dense area mean (SDa)

46.23 (34.07)

36.50 (29.36)

      

   Q1: 0.00-11.69 cm2

86

416

1.00

-

-

-

  

   Q2: 11.70-26.24 cm2

114

389

1.41

1.02-1.94

0.04

-

  

   Q3: 26.31-39.95 cm2

117

386

1.50

1.08-2.07

0.014

-

  

   Q4: 39.99-59.87 cm2

142

361

1.94

1.41-2.66

< 0.001

-

  

   Q5: 59.92-201.49 cm2

175

328

2.85

2.09-3.90

< 0.001

-

  

P for trend

    

< 0.001

   

Percentage dense area (PDA) Mean (SD)

29.30 (19.24)

23.81 (17.91)

      

   Q1: 0.00-7.01%

85

417

1.00

-

-

-

-

 

   Q2: 7.02-18.08%

126

377

1.62

1.18-2.21

0.003

1.32

0.78-2.21

0.3

   Q3: 18.09-28.33%

115

388

1.46

1.06-2.01

0.022

0.96

0.52-1.75

0.9

   Q4: 28.37-40.84%

136

367

1.89

1.38-2.60

< 0.001

1.02

0.54-1.91

0.95

   Q5: 40.86-84.74%

172

331

2.71

1.98-3.71

< 0.001

1.25

0.65-2.40

0.5

P for trend

    

< 0.001

  

0.7

Nondense area mean (SD)

123.89 (65.79)

131.66 (64.28)

      

   Q1: 10.11-74.59

144

358

1.00

-

-

-

-

 

   Q2: 74.59-104.07

146

357

0.97

0.74-1.28

0.83

1.02

0.77-1.35

0.9

   Q3: 104.14-134.70

116

387

0.73

0.54-0.98

0.04

0.83

0.62-1.13

0.2

   Q4: 134.81-180.79

110

393

0.65

0.49-0.87

0.004

0.78

0.58-1.06

0.1

   Q5: 181.07-456.33

118

385

0.80

0.60-1.08

0.15

1.08

0.79-1.49

0.6

P for trend

    

0.02

  

0.7

  1. aStandard deviation; bOdds ratio; cConfidence interval.