Table 1.

User engagement scale dimensions.

Dimension	Description
Focused attention	On the basis of some characteristics of the flow theory: focused concentration, absorption, and temporal dissociation
Perceived usability	Affective (frustration) and cognitive (effortful) aspects as a result of the interaction
Aesthetic appeal	Sensory and visual appearance of an interface
Reward	Hedonic aspects of experience, felt involvement, overall success of the interaction, and willingness to engage with the app in the future