Fig. 2

ROC curves showing diagnostic accuracy of pulmonary nodule classifier (PNC) evaluated in PLCO nodule population relative to tumor stage: stage IA (n = 51, black), stage IB (n = 15, grey), stage II (n = 10, green), stage III (n = 19, blue) and stage IV (n = 13, red). Area under the curve (AUC) and 95% confidence intervals are shown