Intervention | No. of studies (case–control) | No. of participants | Effect size: OR (95% CI) |
---|---|---|---|
Thorough disinfection of living quarters | 1 | 990 | 0.3 (0.23 to 0.39) |
Frequent handwashing | 6 | 2077 | 0.45 (0.36 to 0.57) |
Wearing a mask | 5 | 1991 | 0.32 (0.25 to 0.40) |
Wearing gloves | 4 | 712 | 0.43 (0.29 to 0.65) |
Wearing gowns | 4 | 712 | 0.23 (0.14 to 0.37) |
* OR<1 favours intervention.