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Forest plot of HR for overall survival impact of operative approach (segmentectomy versus lobectomy) of stage I NSCLC patients. The pooled HR displayed in this figure when compared with segmentectomy suggested that there was not a significant benefit of lobectomy on HR of stage I patients (7-21) (HR 1.04; 95% CI, 0.92–1.18, P=0.50) (22-33). HR, hazard ratio; NSCLC, non-small cell lung cancer; CI, confidence interval; df, degree of freedom; SE, standard error.
