True HIV Positive (PHIV) | True HIV Negative (1 − PHIV) | |||||||
---|---|---|---|---|---|---|---|---|
Outcomes | DHC+, EIA+, WB+ | DHC-, EIA+, WB+ | DHC+, EIA- | DHC-, EIA- | DHC+, EIA- | DHC+, EIA+, WB- | DHC-, EIA+, WB- | DHC-, EIA- |
Probability of result | (PHIV ∗ SenDHC ∗ SenEIA ∗ SenWB ) | (PHIV ∗ (1 − SenDHC) ∗ SenEIA ∗ SenWB ) | (PHIV ∗ SenDHC ∗ (1 − SenEIA)) | (PHIV∗ (1 − SenDHC) ∗ (1 − SenEIA)) | ((1 − PHIV) ∗ (1 − SpecDHC) ∗ SpecEIA ) | ((1 − PHIV) ∗ (1 − SpecDHC) ∗ (1 − SpecEIA) ∗ SpecWB ) | ((1 − PHIV) ∗ SpecDHC ∗ (1 − SpecEIA) ∗ SpecWB ) | ((1 − PHIV) ∗ SpecDHC ∗ SpecEIA ) |
Inputs | ||||||||
 Visit 1: Initial Screening – Volunteer Peer Testing Facilitators | ||||||||
  Consult time | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min |
  Staff Wage (Rate/Hour): | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
  Staffing | Volunteer Nurse | Volunteer Nurse | Volunteer Nurse | Volunteer Nurse | Volunteer Nurse | Volunteer Nurse | Volunteer Nurse | Volunteer Nurse |
 Pathology costs | ||||||||
  Rapid Alere Determine Test | $11 | $11 | $11 | $11 | $11 | $11 | $11 | $11 |
  EIA test | $15.651 | $15.651 | $15.651 | $15.651 | $15.651 | $15.651 | $15.651 | $15.651 |
  WB confirmatory | $29.002 | $29.002 | $29.002 | $29.002 | ||||
 Visit 2: Test Results – Community Peer Organisation Bulk Billing GP Clinic | ||||||||
  Consult time | 40 min | 40 min | 20 min | 20 min | 20 min | 20 min | ||
  Medicate Rebate | $105.553 | $105.553 | $71.704 | $71.704 | $71.704 | $71.704 | ||
  Staffing | GP | GP | GP | GP | GP | GP | ||
Total Cost of Each Outcome | $161.20 | $161.20 | $98.35 | $26.65 | $98.35 | $127.35 | $127.35 | $26.65 |
Average cost per person tested | =(PHIV ∗ SenDHC ∗ SenEIA ∗ SenWB) ∗ AC per True HIV PositiveDHC + , EIA + , WB+ + (PHIV ∗ (1 − SenDHC) ∗ SenEIA ∗ SenWB) ∗ AC per True HIV PositiveDHC − , EIA + , WB+ + (PHIV ∗ SenDHC ∗ (1 − SenEIA)) ∗ AC per False NegativeDHC + , EIA− + (PHIV ∗ (1 − SenDHC) ∗ (1 − SenEIA)) ∗ AC per False NegativeDHC − , EIA− + ((1 − PHIV) ∗ (1 − SpecDHC) ∗ SpecEIA) ∗ AC per False HIV PositiveDHC + , EIA− + ((1 − PHIV) ∗ (1 − SpecDHC) ∗ (1 − SpecEIA) ∗ SpecWB) ∗ AC per False HIV PositiveDHC + , EIA + , WB− + ((1 − PHIV) ∗ SpecDHC ∗ (1 − SpecEIA) ∗ SpecWB) ∗ AC per False HIV PositiveDHC − , EIA + , WB− + ((1 − PHIV) ∗ SpecDHC ∗ SpecEIA) ∗ AC per True NegativeDHC − , EIA− | |||||||
Average number of tests for a positive diagnosis | \( =\frac{1}{\left({P}_{HIV}\ast Se{n}_{DHC}\ast Se{n}_{EIA}\ast Se{n}_{WB}\right)+\left({P}_{HIV}\ast \left(1- Se{n}_{DHC}\right)\ast Se{n}_{EIA}\ast Se{n}_{WB}\right)} \) |