Table 1.

Construct measurement.

Construct, label, and source		Item
IQa [59]
	Relevance1	For your health information needs, to what degree do you believe the internet health information provided by the website was applicable to your needs?
	Relevance2	For your health information needs, to what degree do you believe internet health information provided by the website was related to your needs?
	Relevance3	For your health information needs, to what degree do you believe internet health information provided by the website was pertinent to your needs?
	Relevance4	For your health information needs, to what degree do you believe internet health information provided by the website was relevant to your needs?
	Understandability1	For your health information needs, to what degree do you believe internet health information provided by the website was clear in meaning?
	Understandability2	For your health information needs, to what degree do you believe internet health information provided by the website was easy to read?
	Understandability3	For your health information needs, to what degree do you believe internet health information provided by the website was easy to comprehend?
	Understandability4	For your health information needs, to what degree do you believe internet health information provided by the website was understandable?
	Adequacy1	For your health information needs, to what degree do you believe internet health Information provided by the website was sufficient?
	Adequacy2	For your health information needs, to what degree do you believe internet health information provided by the website was complete?
	Adequacy3	For your health information needs, to what degree do you believe internet health information provided by the website was adequate?
	Adequacy4	For your health information needs, to what degree do you believe internet health information provided by the website contained the necessary topics or categories?
	Usefulness1	For your health information needs, to what degree do you believe internet health information provided by the website was informative?
	Usefulness2	For your health information needs, to what degree do you believe internet health information provided by the website was valuable?
	Usefulness3	For your health information needs, to what degree do you believe internet health information provided by the website was helpful?
	Usefulness4	For your health information needs, to what degree do you believe internet health information provided by the website was useful?
PWOMb [60]
	PWOM1	In online reviews, the physician is very popular and many patients come to see the physician.
	PWOM2	In online reviews, patients who visited the physician had a good experience.
	PWOM3	According to online reviews, the physician is a good physician.
	PWOM4	According to online reviews, the physician has a good relationship with patients.
PSDc [23]
	PSD1	I have a good idea of the disease-related information (eg, symptoms, causes of disease, treatment methods, etc).
	PSD2	I have sufficient information about the disease (eg, symptoms, cause of disease, treatment, etc).
	PSD3	I possess adequate knowledge about the disease-related information (eg, symptoms, causes of disease, treatment methods, etc).
PSPMSd [23]
	PSPMS1	I have a good idea of the medical services of the physician whom I visited this time.
	PSPMS2	I have sufficient information about the medical services of the physician for this visit.
	PSPMS3	I possess adequate knowledge about the medical service information of the physician whom I visited this time.
FPOe [24]
	FPO1	In this visit, the physician might not have provided good service but charged a high price.
	FPO2	In this visit, the physician might have overexamined, unnecessarily examined, or overtreated me.
	FPO3	In this visit, the physician might have received a rebate for prescribing an overpriced drug (eg, imported drug).
	FPO4	In this visit, the physician might have breached formal or informal agreements to his or her benefit.
Tf [61,62]
	T1	The physician is sincerely concerned about my medical issues
	T2	The physician is honest in his or her medical practices
	T3	I believe that the physician does a very good job
	T4	I feel that I can count on the physician to help me with my medical problems
MUISg [3]
	MUIS1	I don’t know what is wrong with me
	MUIS2	I have a lot of questions without answers.
	MUIS3	It is difficult to know if the treatments or medications I am getting are helping.
	MUIS4	Because of the unpredictability of my illness, I cannot plan for the future.
	MUIS5	The effectiveness of the treatment is undetermined.
PUh [63]
	PU1	I think the rationality of the medical services provided by the physician involves a high degree of uncertainty.
	PU2	I think the rationality of the medicine prescribed by the physician is uncertain.
	PU3	I think the rationality of the disease examination and treatment plan is uncertain.
	PU4	The rationality of the services provided by the physician is uncertain (ie, the service I received may not be exactly what I wanted).
	PU5	I feel the uncertainty associated with the rationality of the medical services provided by the physician is high.
TDi [64]
	TD1	I generally trust other people.
	TD2	I generally have faith in humanity.
	TD3	I feel that people are generally reliable.
	TD4	I generally trust other people unless they give me reasons not to.

^aIQ: web-based health information quality.

^bPWOM: perceived web-based word-of-mouth information about physicians.

^cPSD: perceived information scarcity about the diseases.

^dPSPMS: perceived information scarcity about the physicians’ medical services.

^eFPO: fears of physician’s opportunism.

^fT: patients’ trust in the physician.

^gMUIS: patients’ uncertainty about diseases.

^hPU: patients’ uncertainty about the physician.

ⁱTD: trust tendency.