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Receiver operating characteristic analysis for 2 groups: nodules with pathological invasiveness ≤5 mm (n = 33) and >5 mm (n = 15). Cutoff value of solid portion on thin-section CT was more than 7.3 mm to predict the pathological invasiveness >5 mm (P < 0.0001): sensitivity, 93.3%; specificity, 66.7%.
