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Kaplan–Meier estimates of observed 5-y survival in CT-screening INT-IEO trial. (A) Data arranged according to the extent of disease: 92% for stage I (95% CI: 70.0–97.8) and 7% for stage II–IV (95% CI: 0.5–27.5, P < 0.001). (B) Data arranged according to the year of CT-detection: 77% for lung cancers detected in the first 2 y of the study (95% CI: 53.7–89.8) and 36% for lung cancers diagnosed from third to fifth years (95% CI: 13.7–58.7, P = 0.005)
