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Hospitals, hospital caseload and mortality risk according to hospital volume quintiles a Number of hospitals and mean annual caseload per hospital per year. b Risk‐adjusted odds ratios (ORs) with 95 per cent c.i. for in‐hospital mortality. c Risk‐adjusted ORs and 95 per cent c.i. for in‐hospital mortality following elective surgery. *P < 0·050, †P ≤ 0·010, ‡P < 0·001 (logistic regression analysis).
