Table 3.

Responses to individual System Usability Scale questions

Question	Median (IQR)	Mean (SD)
1. I like using the system	3 (2–4)	2.8 (1.3)
2. I find the system unnecessarily complex	4 (2–4)	3.4 (1.3)
3. I think the system is easy to use	3 (2–4)	2.9 (1.3)
4. I need the support of a technical person to use the system	2 (1–3)	2.2 (1.1)
5. I find the various functions in the system are well integrated	2 (1–4)	2.5 (1.3)
6. I think there is too much inconsistency in the system	3 (2–4)	3.3 (1.2)
7. I learnt to use the system very quickly	4 (3–4)	3.5 (1.1)
8. I find the system very cumbersome to use	4 (2–4)	3.4 (1.3)
9. I feel very confident using the system	4 (3–4)	3.7 (1.0)
10. I needed to learn a lot of things before I could get going with this system	3 (2–4)	3.0 (1.2)