Table 3.

Means ± SDs for the System Usability Scale by item and group showing original and transformed scores.

	Middle-Aged (n = 25)		Elderly (n = 27)		p Value
Item	Original Score (1–5)	Transformed and Reversed Score (1–4)	Original Score (1–5)	Transformed and Reversed Score (1–4)
1. I think that I would like to use this system frequently.	3.4 ± 1.76	2.4 ± 1.76	3.22 ± 1.69	2.22 ± 1.69	NS
2. I found the system unnecessarily complex.	1.28 ± 0.89	3.7 ± 0.89	1.48 ± 1.19	3.52 ± 1.19	NS
3. I thought the system was easy to use.	4.80 ± 0.50	3.8 ± 0.50	4.52 ± 0.98	3.52 ± 0.98	NS
4. I think that I would need the support of a technical person to be able to use this system.	1.92 ± 1.58	3.1 ± 1.58	2.15 ± 1.68	2.85 ± 1.68	NS
5. I found the various functions in this system were well integrated.	4.04 ± 1.37	3.0 ± 1.37	4.11 ± 1.28	3.11 ± 1.28	NS
6. I thought there was too much inconsistency in this system.	1.56 ± 1.04	3.4 ± 1.04	1.78 ± 1.37	3.22 ± 1.37	NS
7. I would imagine that most people would learn to use this system very quickly.	3.80 ± 1.68	2.8 ± 1.68	3.81 ± 1.57	2.81 ± 1.57	NS
8. I found the system very cumbersome to use.	1.32 ± 0.95	3.7 ± 0.95	1.37 ± 1.01	3.63 ± 1.01	NS
9. I felt very confident using the system.	4.56 ± 1.00	3.6 ± 1.00	4.51 ± 0.56	3.81 ± 0.56	NS
10. I needed to learn a lot of things before I could get going with this system.	1.40 ± 0.96	3.6 ± 0.96	1.63 ± 1.33	3.37 ± 1.33	NS
Total score		82.8 ± 13.7		80.2 ± 17.9	NS

SD = standard deviation.