Table 4.

Intervention usability ratings as reported on the modified mobile health (mHealth) App Usability Questionnaire at intervention week 6 (n=12).

Modified mHealth App Usability Questionnaire item			Strongly agree, n (%)		Agree, n (%)		Somewhat agree, n (%)		Neither agree nor disagree, n (%)		Somewhat disagree, n (%)		Disagree, n (%)		Strongly disagree, n (%)
Ease-of-use questions
	The program was easy to use.	5 (42)		6 (50)		1 (8)		0 (0)		0 (0)		0 (0)		0 (0)
	It was easy for me to learn to use the program.	4 (33)		7 (58)		1 (8)		0 (0)		0 (0)		0 (0)		0 (0)
	I like the program.	6 (50)		6 (50)		0 (0)		0 (0)		0 (0)		0 (0)		0 (0)
	The program was well organized, so I could easily find the information I needed.a	3 (27)		7 (64)		1 (9)		0 (0)		0 (0)		0 (0)		0 (0)
	I feel capable of using this program.	7 (58)		4 (33)		1 (8)		0 (0)		0 (0)		0 (0)		0 (0)
Satisfaction questions
	I would use this program again.	7 (58)		4 (33)		1 (8)		0 (0)		0 (0)		0 (0)		0 (0)
	Overall, I am satisfied with the program.	6 (50)		5 (42)		1 (8)		0 (0)		0 (0)		0 (0)		0 (0)
	The program is an acceptable way to receive help with substance use.	5 (42)		5 (42)		2 (17)		0 (0)		0 (0)		0 (0)		0 (0)
	The program does what I expected it to.	3 (25)		8 (67)		0 (0)		1 (8)		0 (0)		0 (0)		0 (0)
Usefulness questions
	The program would be useful for my health and well-being.	5 (42)		7 (58)		0 (0)		0 (0)		0 (0)		0 (0)		0 (0)
	The program improved my access to health care services.	3 (25)		2 (17)		3 (25)		4 (33)		0 (0)		0 (0)		0 (0)
	The program helped me manage my substance use effectively.	2 (17)		4 (33)		3 (25)		3 (25)		0 (0)		0 (0)		0 (0)
	I felt confident that any information I sent to my recovery coach using the app would be received.	7 (58)		3 (25)		1 (8)		1 (8)		0 (0)		0 (0)		0 (0)
	I felt comfortable communicating with my recovery coach using the app.	5 (42)		4 (33)		2 (17)		1 (8)		0 (0)		0 (0)		0 (0)

^aOne participant did not answer the question.