Table 1.

Primary outcomes.

Outcome measure			Measure description		Time frame
Primary outcome
	Usability of a health app among patients and carers at the end of the trial (1 month)	A validated questionnaire, MAUQa [44], will be used to determine the usefulness and applicability of an app with a conversational agent or chatbot among patients and carers. The questionnaire consists of 3 subscales, which are ease of use (5 items), interface and satisfaction (7 items), and usefulness (6 items). Participants rate each of the items using a 7-point Likert scale ranging from 1 (strongly disagree) to 7 (strongly agree). The usability of the app is determined by the total and average of all statements—the higher the overall average, the better the usability of the app. However, if the average score is lower than 4, it means that the usability of the app is not good. The MAUQ exhibited strong psychometric characteristics, as evidenced by an overall Cronbach α value of .914 [44].		End-of-trial (1 month)
	Qualitative perspective on a conversational agent or chatbot app usage experience among patients and carers at the end of the trial (1 month).	A focus group discussion among the app users will be carried out to collect feedback on the user experience at the end of the trial. Qualitative data on app usability, app applicability, app relevance, and user feedback will be retrieved from the focus group discussion.		End-of-trial (1 month)

^aMAUQ: mHealth (mobile health) App Usability Questionnaire.