Table 9 System Usability Scale responses. Descriptive statistics (N, mean value, standard deviation and 95% confidence interval) for the pooled cohort (N = 306, Cohorts 1,2,3,4,5 and 6 combined) responses

Q1

I think that I would like to use this system frequently

All

305

4.06

0.97

0.11

Q2

I found the system unnecessarily complex

All

306

2.11

1.19

0.14

Q3

I thought the system was easy to use

All

306

4.22

0.92

0.10

Q4

I think that I would need the support of a technical person to be able to use this system

All

306

2.12

1.25

0.14

Q5

I found the various functions in this system were well integrated

All

305

3.95

0.93

0.11

Q6

I thought there was too much inconsistency in this system

All

306

2.02

1.06

0.12

Q7

I would imagine that most people would learn to use this system very quickly

All

305

4.19

0.87

0.10

Q8

I found the system very cumbersome to use

All

300

2.53

1.25

0.14

Q9

I felt very confident using the system

All

306

4.29

0.82

0.09

Q10

I needed to learn a lot of things before I could get going with this system

All

306

2.27

1.28

0.15