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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.