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Fig. 1. —Decision tree shows how we calculated cost of delayed versus immediate reporting of results of screening mammography. Normal = no abnormalities detected on the mammogram, and no additional imaging required. Abnormal = abnormality detected on the mammogram, and additional imaging required. p-normal = probability that mammographic findings are normal. p-abnormal = probability that mammographic findings are abnormal. Probability that mammographic findings are normal plus probability that they are abnormal must equal 100%.