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Figure 3 Relationship between gated ejection fraction and percent of the myocardium ischemia with respect to prediction of likelihood (Lk) of catheterization referral based on logistic regression model. Results are shown for percent of the myocardium ischemia values of 0%, 5%, 7.5%, 10%, 12.5%, 15%, 20%, and 30%. SPECT = single-photon emission computed tomography.