Table 2.

Primary outcomes of the pilot studies.

Outcomes		Pilot study 1	Pilot study 2
Overall satisfaction score, median (25th percentile, 75th percentile)a		8 (7,9)	7 (6,8)
Net promoter scoreb
	Total score	–9	0
	Promoters, n (%)	9 (29)	7 (37)
	Detractors, n (%)	12 (39)	7 (37)
Usability
	System usability score, mean (SD)c	76 (15)	71 (20)
Usaged
	Week 1, n (%)	28 (100)	21 (78)
	Week 2, n (%)	26 (93)	11 (41)
	Week 3, n (%)	21 (75)	11 (41)
	Week 4, n (%)	17 (61)	10 (37)

^aScale of 1-10. The higher the score, the higher the satisfaction.

^bPilot study 1, n=31; Pilot study 2, n=19.

^cScale of 0-100.

^dPercentage of weekly questionnaires that were completed in the app. Pilot study 1, n=28; Pilot study 2, n=27.