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Table 2 Percent density, overall and for women age 50+ at mammogram

From: Case-control study of mammographic density and breast cancer risk using processed digital mammograms

Quintile group Frequency Model 1a Model 2b Model 3c
  Case Control OR 95 % CI OR 95 % CI OR 95 % CI
Percent density, overall (297 cases and 1149 controls)
 Q1: 6.08 or less 40 229 1.00 Ref 1.00 Ref 1.00 Ref
 Q2: 6.09–11.94 49 230 1.41 0.87–2.29 1.41 0.86–2.29 1.49 0.91–2.45
 Q3: 11.95–20.04 60 230 2.37 1.44–3.89 2.38 1.44–3.91 2.57 1.54–4.30
 Q4: 20.05–31.56 69 230 3.08 1.87–5.06 2.95 1.79–4.88 3.22 1.91–5.43
 Q5: 31.57+ 79 230 4.45 2.62–7.56 4.36 2.55–7.43 4.88 2.78–8.55
Percent densityd    1.66 1.39–1.97 1.64 1.38–1.96 1.70 1.41–2.04
Percent density, women age 50+ (288 cases and 1116 controls)
 Q1: 6.07 or less 40 223 1.00 Ref 1.00 Ref 1.00 Ref
 Q2: 6.08–11.71 48 223 1.39 0.85–2.26 1.39 0.85–2.27 1.47 0.89–2.43
 Q3: 11.72–19.71 57 223 2.23 1.35–3.68 2.24 1.36–3.71 2.43 1.45–4.08
 Q4: 19.72-30.97 66 223 2.97 1.79–4.92 2.87 1.72–4.76 3.13 1.85–5.31
 Q5: 30.98+ 77 224 4.22 2.49–7.16 4.16 2.45–7.08 4.65 2.66–8.14
Percent densityd    1.64 1.38–1.95 1.63 1.36–1.94 1.68 1.40–2.02
  1. aAdjusted for matching factors (age at FFDM, laterality, density batch number), BMI (continuous), and BMI (categorical)
  2. bAdjusted for matching factors, BMI (categorical and continuous), parity, first-degree family history, and hormone use
  3. cAdjusted for matching factors, BMI (categorical and continuous), parity, first-degree family history, hormone use, and breast area (continuous)
  4. dORs for square root of percent density (continuous) per standard deviation unit