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Cumulative Incidence of Postoperative Opioid Use. Kaplan-Meier plot showing the cumulative incidence of postoperative opioid use over the first 24 hours according to the treatment group. The median time to the first opioid was 5.4 hours for hydromorphone and 12.1 hours for morphine (log rank test p = 0.200). CI = confidence interval; HR = Hazard Ratio
