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Table 2 Stratification of subjects from S2 according to quartiles of controls based on various scores

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

Score   Q1 Q2 Q3 Q4
Percent density Controls 109 (25%) 110 (25%) 110 (25%) 110 (25%)
  Cases 34 (15%) 65 (29%) 51 (23%) 76 (34%)
  P value 0.004 NS NS 0.002
MTR Controls 111 (25%) 111 (25%) 109 (25%) 111 (25%)
T1 Cases 38 (17%) 51 (23%) 50 (22%) 87 (38%)
  P value 0.015 NS NS <0.001
MTR Controls 110 (25%) 111 (25%) 111 (25%) 110 (25%)
T2 Cases 31 (14%) 48 (21%) 66 (29%) 81 (36%)
  P value <0.001 NS NS 0.003
MTR Controls 110 (25%) 111 (25%) 112 (25%) 109 (25%)
T3 Cases 35 (15%) 47 (21%) 63 (28%) 81 (36%)
  P value 0.005 NS NS 0.002
  1. Mammographic texture resemblance (MTR) scores require training. 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.