The clinical decision model with different final endpoints and outcomes. Twelve possible diagnostic categories a 1 to a 12 are shown. The associated probability p of a patient falling into each category is shown in Table 2, as well as the expected cost per category over 1 and 2 years from initial visit. The outcome, i.e. degree of agreement e between initial allergy test result and the diagnosis assigned (e = 1 denotes agreement) is shown in the figure.