Analysis stratified by quintiles of risk at admission (risk synergy), with Q1 being the lowest-risk quintile and Q5 being the highest-risk quintile, revealed a significant trend of increased differences in outcomes among ranked and unranked hospitals (Table 2 ).
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Clinical Outcomes, Costs, and Value of Surgery Among Older Patients with Colon Cancer at US News and World Report Ranked Versus Unranked Hospitals.
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