Table 3.

Summary of results of feasibility criteria.

Feasibility criteria		Targets	Results	Conclusions
Study procedures
	Willingness to participate	Percentage of willing patients >70%	76% of the invited patients were willing to participate	Feasible
	Participation rate	Participation rate >60%	The participation rate was 63%	Feasible
	Retention rate	A retention rate of >80%	The number of dropouts during the study was 16; this resulted in a retention rate of 72%	Marginally feasible
	Data collection	Complete outcome data of PAa in at least 70% of all participants at follow-up	Approximately 31% of the PA data were missing; the number of complete cases was 9, and 8 cases had <10% missing data	Not feasible
System usability
	Efficiency	SUSb score ≥70	Mean 79.6 (SD 24.2)	Feasible
	Learnability	SUS score ≥70	Mean 74.0 (SD 27.5)	Feasible
	Satisfaction	SUS score ≥70	Mean 75.0 (SD 25.2)	Feasible
User experience
	Study patients	Qualitative data about acceptability, satisfaction, and experienced added value	Wearing the PAMc was acceptable, patients were largely positive about the PAM and Atris app, and most patients experienced an added value; technical problems and the comfort of the ankle strap need to be improved	Feasible

^aPA: physical activity.

^bSUS: System Usability Score.

^cPAM: Physical Activity Monitor.