Fig. 5From: The impact of surgery and age on mortality with primary trachea malignant tumors: a retrospective study based on propensity-score matching analysisThe overall survival curves based on surgery in different cohorts with tumor size < 3.1 cm (a), tumor size 3.1-5.0 cm (b), tumor size > 5.0 cm (c), and unknown tumor size (d)Back to article page