Table 01.

Case control studies

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Thorough disinfection of living quarters	1	990	Odds Ratio (M‐H, Fixed, 95% CI)	0.30 [0.23, 0.39]
2 Frequent handwashing	6	2077	Odds Ratio (M‐H, Fixed, 95% CI)	0.45 [0.36, 0.57]
3 Wearing mask	5	1991	Odds Ratio (M‐H, Fixed, 95% CI)	0.32 [0.25, 0.40]
4 Wearing N95 mask	2	340	Odds Ratio (M‐H, Fixed, 95% CI)	0.09 [0.03, 0.30]
5 Wearing gloves	4	712	Odds Ratio (M‐H, Fixed, 95% CI)	0.43 [0.29, 0.65]
6 Wearing gowns	4	712	Odds Ratio (M‐H, Fixed, 95% CI)	0.23 [0.14, 0.37]
7 All interventions	2	369	Odds Ratio (M‐H, Fixed, 95% CI)	0.09 [0.02, 0.35]

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