Fig. 2

(Top) Kaplan–Meier survival curves for overall survival (OS) in early non-small cell lung cancer (NSCLC) patients after lobectomy and segmentectomy before propensity score matching a OS, hazard ratio (HR) 1.561; 95% confidence interval (CI) 1.292–1.885; P < 0.001; b lung cancer-specific survival (LCSS), HR 1.551; 95% CI 1.198–2.009; P = 0.001. (Bottom) Kaplan–Meier survival curves for OS in patients receiving segmentectomies and lobectomies after propensity score matching. c OS, HR 0.914; 95% CI 0.730–1.444; P = 0.434; d LCSS, HR 0.920; 95% CI 0.677–1.249; P = 0.593