Table 1

Eligibility criteria for articles discovered through database searching

Inclusion criteriaExclusion criteria
Title screen: one of the key terms aboveNon-English language studies due to language abilities of authors and rapid timelines
Abstract screen: could not rule out respirator versus FRSM comparison in full textIrrelevant titles
Full text: any comparison between FRSM and respiratorSearch results not specific to FRSMs, FFP respirators or SARS-CoV-2
Any study design containing primary dataJournals not accessible online
Published on any date
Preprints/Unpublished articles found online
Any studies cited on UK Government COVID-19 PPE advice website
  • FFP, filtering face piece; FRSM, fluid repellent surgical mask; PPE, personal protective equipment.