The Society of Thoracic Surgeons (STS) Adult Cardiac Surgery Database uses risk-adjusted expected mortality to create 'observed-to-expected' (O/E) ratios. An O/E ratio below 1.0 indicates:
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A
Worse-than-expected outcomes relative to national benchmarks
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B
Better-than-expected outcomes relative to national benchmarks
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C
Insufficient case volume to calculate meaningful statistics
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D
Compliance with CMS quality reporting requirements