Annals of internal medicine
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To systematically review the methodologic rigor of the research on volume and outcomes and to summarize the magnitude and significance of the association between them. ⋯ High volume is associated with better outcomes across a wide range of procedures and conditions, but the magnitude of the association varies greatly. The clinical and policy significance of these findings is complicated by the methodologic shortcomings of many studies. Differences in case mix and processes of care between high- and low-volume providers may explain part of the observed relationship between volume and outcome.
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To systematically review the methodologic rigor of the research on volume and outcomes and to summarize the magnitude and significance of the association between them. ⋯ High volume is associated with better outcomes across a wide range of procedures and conditions, but the magnitude of the association varies greatly. The clinical and policy significance of these findings is complicated by the methodologic shortcomings of many studies. Differences in case mix and processes of care between high- and low-volume providers may explain part of the observed relationship between volume and outcome.