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Previous Volume 355:1840 October 26, 2006 Number 17 Next

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Diagnostic Performance of Digital versus Film Mammography for Breast-Cancer Screening . On page 1775, the first paragraph should have read, "To establish a reference standard, participants were classified as positive for cancer if breast cancer was pathologically verified within 455 days after the initial study mammogram. Participants were classified as negative for cancer if not classified as positive and if their breast-cancer status was determined to be negative by the enrolling institution 10 months or more after study entry, either through follow-up mammography, including subsequent workup, or other information," not "To establish a reference standard, participants were classified as positive for cancer if breast cancer was pathologically verified within 455 days after the initial study mammogram and negative for cancer if their study records showed negative findings on a pathology report of a biopsy specimen, if the follow-up mammogram at 1 year was normal, or if both criteria were met" as printed.

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