Fig. 3.

Prior test (blue solid line) and treatment (blue dashed line) thresholds based on pre-test probability, and posterior test (red solid line) and treatment (red dashed lines) thresholds based on post-test probability, obtained equaling to 0.5 the prior/posterior probabilities of not ruling out (test thresholds) and treating (treatment thresholds) estimated according to model 2. Points (circles and triangles) represent empirical frequencies of decisions according to the true/estimated disease probability