Experiences of using a digital tool, the D-foot, in the screening of risk factors for diabetic foot ulcers

Table 3 Results from the System Usability Scale (SUS) answered by two CPOs

Questions, before the study start	CPO 1 before (after)	CPO 2 before (after)
1. I think that I would like to make a digital assessment.	4 (4)	5 (5)
2. I think I will find that a digital foot assessment is unnecessarily complex.	2 (1)	1 (1)
3. I think I will find that a digital foot assessment is easy to perform.	4 (4)	5 (5)
4. I think that I will need the support of a technical person to be able to make a digital assessment.	4 (3)	5 (2)
5. I think I will find that the various functions for performing digital assessments are well integrated.	4 (3)	5 (5)
6. I think I will find that there is too much inconsistency in the digital assessment.	2 (2)	1 (1)
7. I think that most people will quickly learn how to make a digital assessment.	4 (4)	4 (5)
8. I think I will find making digital assessments very complicated.	2 (2)	1 (1)
9. I think I will feel very confident about making a digital assessment.	4 (4)	5 (5)
10. I think I will need to learn a lot of things before I can make a digital assessment.	2 (3)	4 (1)
Total SUS score per observer	77.5 (70.0)	90.0 (97.5)

Note: The questions that are presented in this table were answered by the CPOs prior to study start. The questions in the SUS that were answered after the study was completed are described in Hellstrand et al. 2017 [31]
Low scores to the questions with an even number should be interpreted as positive, as the user somewhat disagrees (strongly disagree = 1 to strongly agree = 5)
The original data are presented in the table. Thereafter, the total SUS score was calculated as follows: each question was answered with a score (strongly disagree = 1 to strongly agree = 5). From the answers with an odd number, “one” was subtracted. Thereafter, from the answers with an even number, the number was subtracted from “five”. The value obtained per person and question ranged from 0 to 4, with four as the highest response. The sum was based on the converted numbers multiplied by 2.5 and a summary score for all 10 questions, ranging from 0 to 100, was obtained [40].
The 10 questions in the SUS have been translated into Swedish, from the original English text. The Swedish response format was: 1) Håller absolut inte med, 2) Håller inte med, 3) Håller varken med eller inte med, 4) Håller med and 5) Håller fullkomligt med

ISSN: 1757-1146