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Table 4 Correlation of the percent density and mammographic texture resemblance (MTR) scores in the three training regimes on S2

From: Mammographic texture resemblance generalizes as an independent risk factor for breast cancer

   Percent density MTR T1 MTR T2 MTR T3
Percent density Rho 1.00 0.03 0.12 0.22
P value   0.44 0.003 <0.0001
N 665 665 665 665
MTR T1 Rho 0.03 1.00 0.98 0.88
P value 0.44   <0.0001 <0.0001
N 665 668 668 668
MTR T2 Rho 0.12 0.98 1.00 0.90
P value 0.003 <0.0001   <0.0001
N 665 668 668 668
MTR T3 Rho 0.22 0.88 0.90 1.00000
P value <0.0001 <0.0001 <0.0001  
  N 665 668 668 668
  1. Numbers are given for training based on S1 (T1), S2 (T2), and S1 and S2 (T3) respectively. The latter two are performed in a leave-two-out fashion. Reported are the Pearson correlation coefficient Rho, the P values of being different from 0, and N, the numbers of observations on which the estimates are based.