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Figure 3 Incremental prognostic value of extent of reversible Tl-201 single photon emission computed tomography (SPECT) defects, relative to those provided by the combination of clinical, exercise testing and catheterization data. Analysis was performed in the three groups (GI, GII and GIII). The initial models included: left ventricular ejection fraction, number of 70% diseased vessels, proximal left anterior descending artery stenosis and age. In each group, total chi-square values are shown for the initial models (hatched bars) and for the final models obtained after the addition of extent of reversible Tl-201 SPECT defects (solid bars).