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Appropriateness of SPECT by (a) symptoms and (b) pretest likelihood of disease ((a), (b): P < .0001). Symptoms refer to chest pain or anginal equivalent. Pretest likelihood: low, intermediate, or high based on age, gender, and symptoms. A, appropriate (green); U, uncertain (gold); I, inappropriate (red). Number of patients is shown next to the corresponding symbols for each of the appropriateness designations. Percent within each category is reflected on the horizontal axis.
