Table 1.

Involved factors and quality rating of included studies.

First author, date and country	Demographic factors	Knowledge/information	Health promotion factors	Health behavioural factors											Quality rating
				Threat perception		Perceived barriers	Cues to action		Behavioural beliefs		Subjective norms		Behavioural expe-rience	Behav-ioural intention
				Perceived susceptibility	Perceived severity		Recommendation	Disease experience	Perceived-efficacy	Perceived safety	Norm-ative beliefs	Motiv-ations to reply
Frank, 1985, Canada30							√	√	√				√		Low
Pearson, 1994, USA31	√	√	√		√		√		√	√	√		√		Moderate
Honkanen, 1996, Finland32	√	√	√						√	√			√		Moderate
Van Essen, 1997, Netherlands33	√		√	√	√				√	√					Moderate
Nexøe, 1999, Denmark34	√			√	√	√	√		√				√		High
Pregliasco, 1999, Italy35	√	√	√		√		√		√	√			√		Moderate
Abramson, 2000, Israel36	√	√					√		√	√					Moderate
Armstrong, 2001, USA37	√			√	√	√	√		√	√			√		Moderate
Santibanez, 2002, USA38	√	√	√	√						√			√		High
Evans, 2003, UK39	√	√	√	√	√		√		√	√				√	Moderate
Madhavan, 2004, USA40	√							√	√	√	√				High
Chi, 2004, USA41	√	√	√	√	√		√	√	√	√		√			Moderate
Zimmerman, 2004, USA42	√		√	√			√								High
Bardenheier, 2006, USA43	√	√	√		√		√	√	√	√			√		Moderate
Gallagher, 2006, UK44									√		√		√	√	Moderate
Mangtani, 2006, UK45	√		√				√		√	√			√		Moderate
Winston, 2006, USA46	√						√						√	√	Moderate
Lau, 2007, Hong Kong47	√	√		√	√	√	√		√	√	√	√		√	High
Kwong, 2009, Hong Kong48	√		√	√	√	√	√		√	√					Moderate
Kwong, 2008, Hong Kong49	√		√	√	√	√			√	√					Low
Lau, 2008, Hong Kong50	√			√	√	√		√	√	√			√	√	High
Lau, 2009, Hong Kong51	√	√	√	√		√	√		√	√			√	√	Moderate
Avelino-Silva, 2011, Brazil52	√		√	√			√		√	√			√		Low
Matsui, 2011, Japan53	√	√	√	√	√	√			√	√			√		Moderate
Yu, 2014, Hong Kong54	√		√	√	√	√	√		√				√	√	Moderate
Boggavarapu, 2014, USA55	√		√			√	√			√					Moderate
Bödeker, 2015, Germany56	√	√	√	√	√		√		√	√					Moderate
Mo, 2015, Hong Kong57	√	√		√	√		√		√	√				√	High
Klett-Tammen, 2016, Germany58	√	√	√			√	√		√				√	√	High
Cornford, 1999, UK59			√		√				√	√					Moderate
Telford, 2003, UK60		√	√	√			√						√		Moderate
Evans, 2007, UK61		√		√			√		√	√			√		High
Cameron, 2009, USA62	√	√	√	√	√	√	√		√	√			√		High
Payaprom, 2010, Thailand63		√	√	√		√						√
Kwong, 2010, nine countries64				√	√	√			√		√				Moderate
Dixon-Woods, 2004, UK65	√		√	√	√		√		√						Moderate