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Table 2 Perioperative phase of anesthesia-related interventions in multicenter randomized controlled trials (n studies = 445, n patients = 336 966)

From: Mapping multicenter randomized controlled trials in anesthesiology: a scoping review

Perioperative phase Number of studies (%) Number of patients (%)
Preoperative 67 (10.5) 47 702 (7.7)
Intraoperative 233 (36.5) 175 974 (28.6)
Postoperative 165 (25.9) 209 743 (34.1)
Multi-phase (i.e., intervention spanned across 2 or 3 phases) 169 (26.5) 179 650 (29.2)
Not reported 4 (0.6) 2630 (0.4)
Total 638 615 907