Table 1.

Measurement and operational definitions of variables.

Construct		Operational definition	Source	Measurement items
Confirmation		Users’ perception of the congruence between expectation of mHealtha use and its actual performance	[20]	4
Perceived usefulness		Users’ perception of the expected benefits of mHealth use	[21,41]	5
User satisfaction		Users’ affect with (feelings about) mHealth use	[20,42]	3
mHealth continuance		Users’ intention to continue using mHealth	[20,25]	3
Individual
	Habits	The extent to which an individual tends to use the mHealth automatically	[22,33]	4
	Innovativeness	Willingness to try out any new technology	[29,41]	4
Technology
	Availability	The ability of accessing patient information when required	[17,33]	3
	Portability	The degree of ease associated with transporting the mHealth	[17,33]	3
	Maturity	The existence of a level of system quality that is perceived as satisfactory and the perceived need for system improvement by the user.	[33,43]	3
Task
	Time critical	The urgency when accessing information through the mHealth	[17,33]	3
	Interdependence	The degree to which completing tasks using mHealth requires interaction with other people	[17,32,33]	3
	Mobility	The extent to which a task is being performed in different locations using the mHealth	[17,33]	3
Individual performance		The use of mHealth can help health care practitioner improve efficiency, effectiveness, and quality of medical activities	[33,44]	6

^amHealth: mobile health.