TABLE 4.

Meta-analyses only

First author, year [ref.]	Relevant/total studies (n/n)	Population	Intervention	Outcome	Findings
Critically low quality
Aiello, 2008 [36]	13/30	School Childcare centre General community#	Hand hygiene	Reported or diagnosed respiratory illness	All hand hygiene interventions versus no intervention leads to 21% reduction in respiratory illness (95% CI 5–34%) Benzalkonium chloride-based hand sanitiser is 40% effective versus no intervention Antimicrobial soap with education is the best method

^#: general community settings refer to all other community-based settings not fitting into any of the major categories such as school, household, assisted living facility, childcare centre or workplace.