Comparison 1. High‐volume evacuation (HVE) versus no HVE.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Reduction in the level of contamination in aerosols	5		Mean Difference (IV, Random, 95% CI)	Subtotals only
1.1.1 At less than 1 foot from oral cavity ‐ RCT	3		Mean Difference (IV, Random, 95% CI)	‐47.41 [‐92.76, ‐2.06]
1.1.2 At less than 1 foot from oral cavity ‐ CCT	2		Mean Difference (IV, Random, 95% CI)	‐50.19 [‐109.71, 9.33]
1.1.3 On operator face shield/mask	2		Mean Difference (IV, Random, 95% CI)	‐15.71 [‐46.37, 14.95]
1.1.4 At more than 1 foot from oral cavity ‐ RCT	1		Mean Difference (IV, Random, 95% CI)	‐1.00 [‐2.56, 0.56]
1.1.5 At more than 1 foot from oral cavity ‐ CCT	1		Mean Difference (IV, Random, 95% CI)	‐13.56 [‐23.18, ‐3.94]