Figure 2. Smoothed plots of frequency distributions of PPV1 for 21 336 diagnostic mammography examinations with abnormal findings (among radiologists with 10 or more examinations with abnormal findings), as a function of indication for examination. An overlaid solid line indicates the 50th percentile (median), paired dashed lines indicate the 25th and 75th percentiles, and paired dotted lines indicate the 10th and 90th percentiles. A, Work-up of abnormal results detected at screening examination; B, short-interval follow-up; C, evaluation of breast problem, no lump or lump unknown; D, evaluation of breast problem, palpable lump; E, all diagnostic examinations. Corresponding arithmetic mean values for all 26 776 diagnostic examinations with abnormal results are listed in Table 3.