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Fig. 5. —Free-response receiver operating characteristic (ROC) curves for screen-film mammography (, dotted line) and full-field digital mammography (, solid line) based on rating scale of 0-100. Scale for x-axis is probability of false-positive finding occurring on two screening images of given breast and is analogous to false-positive rate in standard ROC experiment. Area under screen-film curve is 0.80; area under digital curve is 0.74. Difference is not statistically significant (p = 0.18).

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