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Screening efficiency, measured by number needed to screen, by lung cancer risk. Reprinted in modified form from PLoS under the Creative Commons Attribution (CC BY) license (31). The number needed to screen to prevent one lung cancer death in the 65th to 100th percentile risk group is 255 (95% CI: 143–1,184), and in the 30th to 65th percentile risk group is 963 (95% CI: 291–2,754). NNS, number needed to screen.
