Table 1.

Cited Sources Used in Construction of Reflective Measures.

PERCEPTIONS OF THREAT OF ILLNESS (COVID-19)	Items adapted from	Vaccination context	Subjects
Perceived Disease Severity (for individual)	•Corace et al. (2013) [35]	•pH1N1	•health care workers
	•Santos et al. (2017) [36]	•flu	•high-risk individuals
	•Adams et al. (2014) [37]	•flu, pneumonia, hepatitis B	•haemodialysis patients
Perceived Disease Severity (for others)	•Corace et al. (2013) [35]	•pH1N1	•health care workers
	•Santos et al. (2017) [36]	•flu	•high-risk individuals
Perceived Susceptibility to COVID-19 (for individual)	•Corace et al. (2013) [35]	•pH1N1	•Health care workers
Perceived Susceptibility to COVID-19 (for others)	new items
EVALUATIONS OF BEHAVIOR (VACCINATION) TO COUNTERACT THREAT OF ILLNESS (COVID-19)	Items adapted from	Vaccination context	Subjects
Conspiracy Beliefs about Vaccination	•Jolley & Douglas (2014) [18]	•fictitious disease (dysomeria)	•British parents
	•Shapiro et al. (2016) [19]	•Human papillomavirus (HPV)	•Canadian parents
Perceived C-19 Vaccine Availability	•Santos et al. (2017) [36]	•flu	•high-risk individuals
	•Wong et al. (2020) [39]	•COVID-19	•Malaysian adults
	•Coe et al. (2012) [38]	•novel (2009) H1N1 influenza	•US adults
Perceived side-effects of C-19 Vaccine	•Shapiro et al. (2018) [40]	•Human papillomavirus (HPV)	•Canadian parents
Trust in government approval of C-19 vaccine	•Shapiro et al. (2018) [40]	•Human papillomavirus (HPV)	•Canadian parents
	•Larson et al. (2015) [4]	•Childhood vaccination	•Not empirically tested
	•Siegrist et al (2003) [41]	•electromagnetic field (EMF) risks*	•Swiss citizens
	•van der Weerd et al. (2011) [30]	•influenza A (H1N1)	•general public
Perceived Ability to Free-Ride	new items
Perceived Effectiveness of COVID-19 Vaccination (for individual)	•Coe et al. (2012) [38]	•novel (2009) H1N1	•US adults
	•Shapiro et al. (2018) [40]	•Human papillomavirus (HPV)	•Canadian parents
	•Larson et al. (2015) [4]	•Childhood vaccination	•Not empirically tested
	•Wong et al. (2020) [39]	•COVID-19	•Malaysian adults
	•Santos et al. (2017) [36]	•flu	•high-risk individuals
Perceived Effectiveness of C-19 Vaccination (for others)	•Shapiro et al. (2018) [40]	•Human papillomavirus (HPV)	•Canadian parents
	•Larson et al. (2015) [4]	•Childhood vaccination	•Not empirically tested

* Tested in non vaccine context of mobile phone antennas.