Is Volume Related to Outcome in Health Care? A Systematic Review and Methodologic Critique of the Literature

By E. Halm, Clara Lee, M. Chassin. Annals of Internal Medicine, 2002

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Extending the CONSORT statement to randomized trials of nonpharmacologic treatment: explanation and elaboration. (2008, background): “In addition, care providers’ expertise and centers’ volume of care can also influence the estimate of the treatment effect (15).”
CONSORT Statement for Randomized Trials of Nonpharmacologic Treatments: A 2017 Update and a CONSORT Extension for Nonpharmacologic Trial Abstracts. (2017, background): “Interventions that are beneficial in one setting may be less effective or even harmful in another setting (23).”
European Hernia Society guidelines on the treatment of inguinal hernia in adult patients (2009, background): “It is unclear whether subspeciality training, centre volume and/or surgeon volume are equally important to determine the outcome [125], but for many procedures, the observed associations between hospital volume and operative mortality are largely mediated by surgeon volume [39].”
2011 ACCF/AHA Guideline for Coronary Artery Bypass Graft Surgery. A report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Developed in collaboration with the American Association for Thoracic Surgery, Society of Cardiovascular Anesthesi (2011, background): “the volume–outcome association often diminishes with proper risk adjustment based on clinical (as opposed to administrative) data (802,808).”