Table 1.

Operationalization of variables.

Construct	Construct definition	Source
ITa identity	The degree to which the use of an IT (ie, a PHDb) is meaningfully related to who people think they are (self-identification).	Carter and Grover [31]
IT mindfulness	The degree to which a user is involved in the present context, alert of details, aware of other potential uses, and open to investigating IT (ie, a PHD) features and failures.	Thatcher et al [25]
Perceived health status	The extent to which an individual believes that the overall status of his/her health and wellness is good.	Bansal and Gefen [39]
Positive word-of-mouth intention	The degree to which a user shares a positive assessment of his/her experience with a PHD with others.	Maxham III [55]
Continued intention to use	The degree to which a user feels he or she will keep using a PHD.	Bhattacherjee [56]
Feature use behavior	The extent to which an individual uses various features and functions of a PHD in different situations.	Lucas Jr and Spitler [57]
Enhanced use behavior	The extent to which an individual explores previously unused features of a PHD to use it for performing additional tasks.	Bagayogo et al [52]

^aIT: information technology.

^bPHD: personal health device.