Table 3 Estimates of OPERA, 95 % confidence intervals (95 % CI) from fitting multiple mammographic density measures together, correlation between estimates (R) and log likelihood (LL) for dense area and percentage dense area

   Cumulus ^a

0.73 (0.53−1.00)

0.05

-0.87

-280.34

   Altocumulus ^a

1.83 (1.30−2.57)

0.001

  Cumulus ^b

1.07 (0.88−1.30)

0.5

-0.6

-285.22

  Cirrocumulus ^b

1.19 (0.97−1.47)

0.1

   Altocumulus ^c

1.32 (1.07−1.65)

0.01

-0.62

-282.17

   Cirrocumulus ^c

1.04 (0.85−1.29)

0.7

  Cumulus ^d

0.71 (0.52−0.98)

0.04

-0.79

-279.97

  Altocumulus ^d

1.77 (1.24−2.51)

0.002

-0.19

  Cirrocumulus ^d

1.10 (0.89−1.36)

0.4

-0.22

   Cumulus ^a

0.87 (0.66−1.14)

0.3

-0.81

-280.79

   Altocumulus ^a

1.59 (1.18−2.14)

0.002

  Cumulus ^b

1.15 (0.96−1.38)

0.1

-0.50

-284.74

  Cirrocumulus ^b

1.14 (0.94−1.37)

0.2

   Altocumulus ^c

1.39 (1.13−1.70)

0.002

-0.51

-284.65

   Cirrocumulus ^c

1.03 (0.86−1.25)

0.7

  Cumulus ^d

0.87 (0.66−1.15)

0.3

-0.74

-284.165

  Altocumulus ^d

1.55 (1.14−2.10)

0.005

-0.15

  Cirrocumulus ^d

1.05 (0.87−1.27)

0.6

-0.23