FIGURE 2. Incremental prognostic value for cardiac events (global ² values on y-axis) obtained with consideration of hierarchical order: rest perfusion status (regional ^99mTc-sestamibi activity score at rest; white bar); rest perfusion status and summed difference score (black bar); and rest perfusion status, summed difference score, and combined assessment of regional perfusion and regional function (i.e., regional wall thickening score at rest) at rest in akinetic or dyskinetic segments (hatched bar). SDS = summed difference score.