TABLE 3.

Calculation of weighted costs for each diagnostic strategy by using proportions and actual costs

TestViral test resultDiagnostic statusProportionCost ($)Weighted cost ($)a
RVPbPositiveTrue positive0.5922,493.001,476
PositiveFalse positive0.0075,327.0039
NegativeTrue negative0.3635,307.001,926
NegativeFalse negative0.0384,836.0061
    Total1.0003,623
DFAPositiveTrue positive0.4412,426.801,070
PositiveFalse positive0.0075,260.8039
NegativeTrue negative0.3635,240.801,900
NegativeFalse negative0.1894,769.80901
    Total1.0003,911
DFA + cultureDFA positiveTrue positive0.4412,426.801,070
DFA positiveFalse positive0.0075,260.8037
DFA negative, culture positiveTrue positive0.0042,447.459
DFA negative, culture positiveFalse positive0.0075,281.4538
DFA negative, culture negativeTrue negative0.3565,261.451,872
DFA negative, culture negativeFalse negative0.1854,790.45887
    Total1.0003,914
DFA + RVPDFA positiveTrue positive0.4412,426.801,070
DFA positiveFalse positive0.0075,260.8037
DFA negative, RVP positiveTrue positive0.0452,506.80114
DFA negative, RVP positiveFalse positive0.0075,340.8039
DFA negative, RVP negativeTrue negative0.3565,320.801,893
DFA negative, RVP negativeFalse negative0.1444,849.80697
    Total1.0003,849
  • a The weighted cost is proportion × cost.

  • b RVP, xTAG RVP test.