Constructing a decision tree involves several steps:
1. Identify the Decision Point: The initial node represents the primary decision or health outcome of interest. 2. List Possible Choices or Events: Each branch from the initial node represents a different choice or event. 3. Determine Outcomes: Subsequent nodes and branches represent the outcomes or further decisions based on the initial choices. 4. Assign Probabilities and Values: Assign probabilities to chance events and values to outcomes to evaluate the decisions quantitatively.