Table 2.

Formulas to calculate the total cost per path in the decision tree

Path	Description	Formula
A	Patient without risk factors (outpatient)	CA = Cris
B	Risk patient with negative MRSA findings (outpatient)	CB = Cris + Csc
C	Patients screened and decolonized on an outpatient basis, followed by inpatient admission	CC = Cris + Csc + Cdec _ out
D	Patient without risk factors (inpatient)	CD = Cris
E	Patient screened in hospital, preemptive isolation to findings, result: MRSA negative	CE = Cris + Csc + Cpre _ iso · Tpre _ iso
F	Patient screened in hospital, preemptive isolation, result: MRSA positive, then isolated and decolonized in hospital	CF = Cris + Csc + Cpre _ iso · Tpre _ iso + Cdec _ hos + Ciso _ hos · Tiso _ hos

Legend: C_A = Costs of path A in the decision tree, C_B = Costs of path B in the decision tree, C_C = Costs of path C in the decision tree, C_D = Costs of path D in the decision tree, C_E = Costs of path E in the decision tree, C_F = Costs of path F in the decision tree