Fig. 7

Decision curve analysis. The y axis measures net benefit, calculated by summing the benefits (true positive findings) and subtracting the harms (false positive findings). The grey line is the net benefit for a strategy of treating all patients. The horizontal line is the net benefit of treating no patients. Dotted line represents net benefit of using a new model. Model A, TNM base model; Model B, the model combining TNM parameters with categorically coded tumor length; Model C, the model combining TNM parameters with continuously coded tumor length