Fig. 4.

Decision curves of the four risk factors and the hybrid nomogram. The y-axis measures the net benefit. The purple line represents the hybrid nomogram. Red, light blue, dark blue, and green lines represent smoking history, TABD, pleural attachment and bubble-like lucency, respectively. The gray line represents the hypothesis that all patients have EGFR mutations. The black line represents the hypothesis that no patients have EGFR mutations. When the threshold probability is <83%, the hybrid nomogram shows the highest net benefit. EGFR, epidermal growth factor receptor; TABD, Thickened adjacent bronchovascular bundles.