Table 1 Studies showing the association of face mask use with COVID-19 infection
Study (year) | Country | Sample size (n) | Main findings | RR (95% CI) |
|---|---|---|---|---|
Heinzerling et al. [19] | USA | 37 | A strong association of proximity of the exposed individual without face mask with the risk of infection | 0.03 (0.002–0.54) |
Doung-ngern et al. [18] | Thailand | 1716 | All time wearing face masks associated with lower risk of SARS-CoV-2 infection compared to individuals who do not wearing face masks | 0.23 (0.09–0.6) |
Wang et al. [21] | China | 493 | Precise occupational protection is necessary for fighting COVID-19 | 0.04 (0.002–0.63) |
Wang et al. [20] | China | 5442 | Inadequate protection leads to higher risk of infection in medical staff members | 0.03 (0.004–0.19) |