Table 2.

Key baseline features of usability testing subjects and corresponding system usability scale (SUS) scores. Scores above the usability standard cut-off (>68) are indicated in italics.

Participant number	Mental health treatment	Years in mental health (mean=25)	Years smoking (mean=20)	Cigarettes per day (mean=11)	SUS usability (mean= 80)	SUS learnability (mean=60)	SUS total (mean= 74)
P1	Case manager, psychiatric nurse	25	9	13	72	100	78
P2	Case manager, psychiatric nurse	29	10	7	88	75	85
P3	Case manager, psychiatrist	20	32	10	44	25	40
P4	Case manager, psychiatrist	39	35	15	81	50	75
P5	Case manager, psychiatrist	12	14	10	94	88	93