Table 2.

System usability scale results (usability study)

No.	Item	N = 15 Mean (SD)
1	I think that I would like to use the DA frequently	3.07 (1.16)
2	I found the DA unnecessarily complex	0.20 (0.78)
3	I thought the DA was easy to use	3.53 (0.74)
4	I think that I would need technical support to be able to use the DA	0.00 (0.00)
5	I found the various functions included in the DA well integrated	3.47 (0.64)
6	I thought there was too much inconsistency in the DA	0.40 (1.06)
7	I would imagine that people would learn to use the DA very quickly	3.53 (0.52)
8	I found the DA very cumbersome to use	0.07 (0.26)
9	I felt very confident using the DA	3.73 (0.46)
10	I needed to learn a lot before I could get going with the DA	0.13 (0.35)
Total score		91.33 (7.61)

Total score range 0–100; higher scores indicate higher perceived usability

DA decision aid