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The receiver operating characteristic curve for the U scoring system. U score=3.5×age (age ≤50=0, age >50=1)+2.0×palpability (non-palpable=0, palpable=1)+2.0×microcalcification (no=0, yes=1) +3.5×sonographic size (≤1.5 cm=0, >1.5 cm=1)+3.5×multiplicity (focal=0, multiple=1). Area under the curve=0.852 (p<0.001; 95% confidence interval, 0.729-0.907).
