. 2019 Jun 3;8(6):e12940. doi: 10.2196/12940

Table 2.

System Usability Scale questionnaire scores from the field usability test.

Questions	P1^a	P2	P3	P4	P5	Mean (SD)
I think that I would like to use this app frequently	4^b	2^c	5^b	3^d	4^b	3.6 (1.1)
I found this app unnecessarily complex	1^b	2^b	1^b	1^b	2^b	1.4 (0.5)
I thought this app was easy to use	5^b	5^b	5^b	5^b	5^b	5 (0)
I think that I would need assistance to be able to use this app	1^b	1^b	1^b	1^b	1^b	1 (0)
I found the various functions in this app were well integrated	5^b	4^b	5^b	5^b	5^b	4.8 (0.4)
I thought there was too much inconsistency in this app	2^b	3^d	1^b	1^b	2^b	1.8 (0.8)
I would imagine that most people would learn to use this app very quickly	5^b	5^b	5^b	5^b	5^b	5 (0)
I found this app very cumbersome/awkward to use	1^b	1^b	1^b	1^b	1^b	1 (0)
I felt very confident using this app	3^d	2^c	5^b	4^b	5^b	3.8 (1.3)
I needed to learn a lot of things before I could get going with this app	1^b	2^b	1^b	2^b	1^b	1.4 (0.5)
Scores	90	72.5	100	90	92.5	—^e
Average	89	—	—	—	—	—

^aPx: participant x.

^bPositive response: agree or strongly agree for positive questions; disagree or strongly disagree for negative questions.

^cNegative response: agree or strongly agree for negative questions; disagree or strongly disagree for positive questions.

^dNeutral response: neither agree nor disagree.

^eNot applicable.