Table 4.

Measurement timeline of constructs (some studies measured several constructs).

Constructs (occurrences)	Measurement stage [references]
	Preuse (n=13)	Initial use (n=7)	Sustained use (n=87)
Perceived usefulness (n=18)	[61]	[57,58]	[52-56,58-60,62-64,89-92]
User satisfaction (n=15)	—a	[57,65]	[54,55,60,62,66-71,89,93,95]
Intention to use (n=11)	[46,47,50,101,102,105]	—	[64,87,90,91,93]
System usability (n=10)	[48]	[57]	[55,67,72-76,96]
Rate of recommendation (n=10)	[61]	—	[53-55,62,73,79,80,104,111]
Actual usage (n=9)	—	—	[64,79,81,83,84,86,90,91,94]
User feedback (n=8)	[61,77]	[78]	[52,53,73,75,79]
Perceived ease of use (n=7)	—	—	[52,53,63,64,73,90,91]
Perceived efficiency (n=6)	—	—	[59,66,73,79,86,89,96]
Attitude toward use (n=4)	[49]		[64,90,91]
User enjoyment (n=4)	[58]	[58]	[64,79]
User engagement (n=3)	—	—	[79,81,88]
Quality of the system (n=2)	—	—	[64,93]

^aNo study measured the construct at that specific measurement stage.