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Postoperative dose of opioids within 24 hours after surgery. Data are calculated by bootstrapping owing to non-normally distributed outcome variables. Doses are in morphine milligram equivalents (MME) to account for different types of opioids (intravenous morphine=1.0, piritramide=0.7, tilidine=0.2, oxycodone=0.8)23 24 used in one centre
