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The hazard ratio of overall survival based on penalized smoothing spline by body mass index (BMI [kg/m2]) at diagnosis for (A) NSCLC and (B) SCLC, and Kaplan Meier survival curves for (C) NSCLC and (D) SCLC patients. BMI data points above 60 kg/m2 are sparse, explaining the wide confidence intervals in A and B. Data are sparse when BMI is greater than 60 kg/m2, and interpretation should be made with caution.
