Table 4.

Factors associated with the response “I am absolutely opposed to using the app” if functions A to C are added.

Independent variables			Function A, odds ratio (95% CI)		Function B, odds ratio (95% CI)		Function C, odds ratio (95% CI)
Female (reference: male)			0.7 (0.5-1.2)		0.8 (0.5-1.2)		0.7 (0.5-1.1)
Age (years) group (reference: aged <34 years)
	35-64	0.9 (0.4-1.8)		1.0 (0.5-2.0)		1.0 (0.5-2.0)
	≥65	0.7 (0.3-1.7)		0.8 (0.3-1.9)		1.0 (0.4-2.2)
Living alone (reference: living with others)			0.9 (0.5-1.6)		0.8 (0.5-1.4)		0.9 (0.5-1.5)
SNSa accessed occasionally per week (reference: accessed below this amount)
	Twitter	1.0 (0.6-1.6)		1.0 (0.6-1.7)		1.0 (0.6-1.6)
	Facebook	0.8 (0.5-1.5)		0.7 (0.4-1.2)		0.7 (0.4-1.2)
	Instagram	1.2 (0.7-2.2)		1.3 (0.7-2.2)		1.1 (0.7-1.9)
COVID-19 infection history (reference: no history)
	Respondent has a history of COVID-19	1.5 (0.7-3.4)		1.5 (0.7-3.4)		1.2 (0.5-3.0)
	Respondent’s family has a history of COVID-19	0.9 (0.6-1.6)		0.9 (0.5-1.5)		0.8 (0.5-1.4)
Respondent fears COVID-19 infection (reference: disagree)
	Fear of health deterioration to oneself	0.9 (0.5-1.8)		0.9 (0.5-1.7)		0.8 (0.4-1.6)
	Fear of transmission to one’s family and friends	0.7 (0.3-1.7)		0.8 (0.3-2.0)		0.7 (0.3-1.6)
	Fear of transmission to people other than family members or friends	0.9 (0.4-2.2)		0.7 (0.3-1.6)		1.0 (0.4-2.3)
Compliance with preventative behaviors (reference: I do not do this)
	Wearing masks when going out	0.8 (0.3-1.8)		0.8 (0.3-1.8)		0.9 (0.4-2.0)
	Restrictions on activities such as meetings	0.5 (0.3-1.0)		0.5 (0.3-1.0)		0.5 (0.3-1.0)
Assessment of authorities (reference: disagree)
	Infection is being controlled through countermeasures conducted by authorities	1.2 (0.6-2.4)		1.3 (0.6-2.6)		1.0 (0.5-2.0)
	Authorities are controlling the infection with a sense of responsibility	0.6 (0.3-1.1)		0.5 (0.2-0.9)		0.6 (0.3-1.2)
	I am concerned that my personal information collected by the authorities might be leaked or misused for other purposes	2.1 (1.4-3.3)		2.3 (1.5-3.5)		2.5 (1.7-3.7)

^aSNS: social networking site.