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Table 2 Evaluation of mammographic features using the BIRADS and Boyd systems

From: Mammographic breast density in infertile and parous women

  Case group (151 women) Control group (154 women) p
BIRADS-1/BIRADS-2 33.1 % 46.1 % 0.026
BIRADS-3/BIRADS-4 66.9 % 53.9 % 0.026
Boyd Cat. A/B 19.2 % 22.7 % NS
Boyd Cat. C/D 27.2 % 45.5 % <0.0001
Boyd Cat. E/F 53.6 % 31.8 % <0.0001