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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