Table 2.

Measurement items of the constructs.

Construct and variables		Measurement item
Information characteristics (IC) [21,45,46]
	IC1	COVID-19 prevention and treatment information on the internet is appropriate for my health demands.
	IC2	COVID-19 prevention and treatment information on the internet is understandable.
	IC3	COVID-19 prevention and treatment information on the internet is shared by most people (eg, by thumb-up or retweet).
	IC4	The argument for COVID-19 prevention and treatment information on the internet is compelling.
	IC5	The publisher of COVID-19 prevention and treatment information on the internet is experienced in the health field.
Social influence (SI) [44,47]
	SI1	People who are important to me think I should get COVID-19 prevention and treatment information from the internet.
	SI2	My family and friends have obtained COVID-19 prevention and treatment information from the internet.
	SI3	It is prevalent to get COVID-19 prevention and treatment information from the internet.
Perceived drawbacks (PD) [48,49]
	PD1	It may take me too much time or expense to adopt COVID-19 prevention and treatment information from the internet.
	PD2	Adopting COVID-19 prevention and treatment information from the internet may cause psychological stress.
	PD3	The health risks associated with the adoption of COVID-19 prevention and treatment information from the internet may outweigh the positive health outcomes.
Perceived benefits (PB) [29]
	PB1	It is important for me to adopt COVID-19 prevention and treatment information to reduce my risk of COVID-19 infection.
	PB2	Adopting COVID-19 prevention and treatment information can help me stay healthy, which is very important to me.
	PB3	The adoption of COVID-19 prevention and treatment information is valuable for me in order to adopt COVID-19 prevention behaviors.
Self-efficacy (SE) [50]
	SE1	I am confident that I can avoid COVID-19.
	SE2	I can figure out how to avoid COVID-19 infection.
	SE3	Even if I contract COVID-19, I can recover soon.
Perceived usefulness (PU) [46,51]
	PU1	The COVID-19 prevention and treatment information on the internet is valuable to me in preventing COVID-19.
	PU2	I can make good use of COVID-19 prevention and treatment information on the internet in my life.
	PU3	COVID-19 prevention and treatment information on the internet can improve the health of my family, friends, and myself.
Adoption intention (AI) [34,52]
	AI1	I will recommend this COVID-19 prevention and treatment information to my family and friends.
	AI2	I will use this COVID-19 prevention and treatment information obtained from the internet in my daily life.
	AI3	I would like to adopt COVID-19 prevention and treatment information, even if it takes my time or money (ie, to buy drugs, protective equipment, etc) to do so.