HH5561 Health Economics and Decision Modelling Assignment,

Assignment Brief: Decision Model Analysis

This assignment requires analyzing a decision model provided in Excel worksheets. The key tasks are:


1. Programming the Decision Model

  • Use the provided structure and data to develop a stylized testing intervention within the decision tree model.

2. Performing Sensitivity Analysis

  • Evaluate how variations in input parameters affect the model’s outcomes, including costs, QALYs, ICER, and INMB.

3. Reporting Results

  • Write a concise report summarizing the findings from the decision model and sensitivity analysis.

Submission Details

Report Word Limit:
Up to 1,000 words, divided into:

  • Results (~800 words): Present base-case findings and outcomes from the sensitivity analysis.
  • Conclusions (~200 words): Provide actionable decision-making insights based on the analysis.

References:

  • Use Harvard Referencing Style consistently.

Formatting Guidelines:

  • Use clear headings to structure the report.
  • Include well-labeled tables and figures where necessary.
  • Ensure visual elements enhance clarity and avoid redundant data.

Worksheets Provided

  1. Introduction: Overview of the assessment and relevant details.
  2. Conceptual Model: Diagram of a decision tree outlining the structure.
  3. Data: Input parameters, including clinical, cost, and outcome details.

Decision Problem

Population: Patients admitted to the hospital with suspected severe infection.
Intervention: Introducing a test to guide antibiotic use in the clinical pathway.
Comparator: Current clinical practice without the test.
Outcomes:

  • Costs: Direct and incremental healthcare costs.
  • Quality-Adjusted Life Years (QALYs): Assessing life quality and duration.
  • Incremental Cost-Effectiveness Ratio (ICER): Comparing cost-effectiveness.
  • Incremental Monetary Net Benefit (INMB): Quantifying benefits in monetary terms.

Model Summary

Structure: Decision tree.
Time Horizon: 12 months.
Perspective: Healthcare payer (costs in Canadian dollars).

Follow-Up Periods:

  • 1 Month: Outcomes immediately post-hospitalization.
  • 12 Months: Infection resolution and symptom evaluation.

Potential Patient States:

  • Alive (with/without complications).
  • Dead (with/without antibiotics).

Clinical Parameters

Parameter Value (Mean) Standard Error Notes
Mortality      
Baseline (current practice) 0.15 0.02 At 1-month follow-up.
RR (Testing strategy) 0.9 0.03  
Mortality after complications 0.3 0.06 At 12-month follow-up.
Mortality (no complications) 0.05 0.01  
Complications      
Baseline (current practice) 0.25 0.04  
RR (Testing strategy) 0.75 0.12  
Antibiotic Initiation      
Baseline (current practice) 0.85 0.07  
RR (Testing strategy) 0.65 0.09  

Cost Parameters (CAN $)

Parameter Value (Mean) Standard Error Notes
Testing Costs $250.00 NA  
Antibiotics $50.00 NA  
Inpatient Stay (Complications) $17,500.00 500 At 1-month follow-up.
Inpatient Stay (Patient Died) $12,500.00 350 At 1-month follow-up.
Inpatient Stay (No Complications) $4,500.00 300 At 1-month follow-up.

Outcome Parameters

Parameter Value (Mean) Standard Error Notes
Alive at 1 Month (QALY) 0.1 NA  
Alive at 12 Months (QALY) 0.75 NA  
QALY Decrement for Complications -0.05 NA  

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