Fig. 2From: The effect of opioid-free anesthesia protocol on the early quality of recovery after major surgery (SOFA trial): study protocol for a prospective, monocentric, randomized, single-blinded trialStandard Protocol Items: Recommendations for Interventional Trials (adapted from SPIRIT figure). BPI, Brief Pain Inventory; D7, 7 days after surgery; D30, 30 days after surgery; H24, 24 hours after surgery; H48, 48 hours after surgery; H72, 72 hours after surgery; M3, 3 months after surgery; OFA, opioid-free anesthesia; PACU, postanesthesia care unitBack to article page