AUC	Area under the curve
CI	Confidence interval
CPSP	Chronic postsurgical pain
ERAS	Enhanced recovery after surgery
GRADE	Grades of recommendation, assessment, development, and evaluation
IQR	Interquartile range
IV	Intravenous
QoR-15	Quality of recovery-15 questionnaire
QoR-40	Quality of recovery-40 questionnaire
NMDA	N-methyl-D-aspartate
NSAID	Nonsteroidal anti-inflammatory drug
OBA	Opioid-based anesthesia
OFA	Opioid-free anesthesia
OME	Oral morphine equivalent
PONV	Postoperative nausea and vomiting
PRISMA	Preferred reporting items for systematic review and meta-analysis
PROSPERO	Prospective register of systematic reviews
REML	Restricted maximum likelihood
RoB 2	Cochrane risk-of-bias tool for randomized trials
RR	Relative risk
SD	Standard deviation
RCT	Randomized controlled trial