Usability of a mobile application on diabetic foot self-care

a descriptive study that uses heuristic assessment of a hybrid app usability. Fifteen users of an outpatient diabetes care service in a capital of Northeastern Brazil participated in the study during April 2018. The usability measurement tool called Smartphone Usability questionnaiRE was applied.

Results:

the lowest score was 77 and the highest was 112, with an average usability of 96.1 points. Usability was framed in the last two levels, 70 and 8o. Users now strongly agree (level 70) and fully (level 80) with the assessed items, which represents good usability of the apps prototype.

Conclusions:

the final product developed focuses on user needs and requirements, which can ensure usability based on effectiveness, efficiency and satisfaction triad.

Descriptors:
Self-Care; Diabetes Mellitus; Telemedicine; Educational Technology; Diabetic Foot

Variables	F	%
Age (50.8 ± 14.4 years)
< 40 years	03	20.0
40 - < 50 years	04	26.7
50 - < 60 years	04	26.7
≥ 60 years	04	26.7
Sex
Male	06	40.0
Female	09	60.0
Marital status
Single	06	40.0
Married	06	40.0
Widow(er)	01	6.7
Divorced	02	13.3
Schooling
Elementary School	09	60.0
High School	02	13.3
Higher Education	04	26.7
Time they know they have DM (11.2 ± 5.4 years)
< 5 years	06	40.0
5-10 years	03	20.0
>10 years	06	40.0
Type of treatment
Oral	04	26.7
Injectable	02	13.3
Oral and injectable	09	60.0

Item	Score
Item	1	2	3	4	N/A
1. I found it easy to enter data in these applications. For example, using QR code, picklist, etc.	01	03	05	-	6
2. When I make a mistake it is easy to correct it.	-	4	3	7	1
3. I found the help/tip given by the app to be helpful.	-	-	2	13	-
4. It was easy to find the information I needed.	-	01	03	11	-
5. I felt in charge using this app.	-	01	06	08	-
6. I found the time it took to complete the tasks to be adequate.	-	-	09	06	-
7. It was easy to learn how to use this app.	-	06	02	08	-
8. The sequences of actions in the application correspond to the way I usually perform them. For example, the order of buttons, data fields, etc.	-	03	08	05	-
9. It is easy to do what I want using this app.	-	03	04	08	-
10. It was easy to navigate the application menus and screens.	-	04	05	06	-
11. The app meets my needs.	-	-	04	09	01
12. I would recommend this app to others.	-	-	-	15	-
13. Even in a hurry I would be able to perform the tasks in this application.	01	03	03	08	-
14. I found the app consistent. For example, all functions can be performed in a similar manner.	-	-	08	07	-
15. It is easy to remember how to do things in this app.	-	03	05	07	-
16. I would use this app often.	01	03	06	05	-
17. The organization of menus and action commands (such as buttons and links) is logical, allowing you to easily find them on the screen.	-	04	05	06	-
18. I was able to successfully complete the tasks using this app.	-	03	06	06	-
19. I enjoyed using this app.	-	-	-	-	-
20. The app provides all the information needed to complete tasks clearly and understandably.	-	-	05	09	-
21. I found the app very complicated to use.	01	01	05	08	-
22. Symbols and icons are clear and intuitive.	08	05	01	01	-
23. I found the texts easy to read.	-	-	01	14	-
24. I found the application unnecessarily complex. I had to remember, research, or think hard to complete the tasks.	11	03	01	-	-
25. The terminology used in texts, labels, titles, etc. It is easy to understand.	-	-	05	10	-
26. I would need support from one person to use this app.	05	03	02	05	-
27. I felt comfortable using this app.	-	03	08	04	-
28. The app behaved as I expected.	-	01	09	04	-
29. I found it frustrating to use this app.	11	04	-	-	-
30. I found that the various functions of the application are well integrated.	-	02	06	07	-
31. I felt very confident using this app.	-	03	08	04	-

User	SURE	Level
01	104	Level 80
02	99	Level 80
03	103	Level 80
04	101	Level 80
05	86	Level 80
06	97	Level 80
07	109	Level 80
08	84	Level 80
09	109	Level 80
10	112	Level 80
11	95	Level 80
12	77	Level 70
13	95	Level 80
14	87	Level 80
15	86	Level 80

Associação Brasileira de Enfermagem SGA Norte Quadra 603 Conj. "B" - Av. L2 Norte 70830-102 Brasília, DF, Brasil, Tel.: (55 61) 3226-0653, Fax: (55 61) 3225-4473 - Brasília - DF - Brazil
E-mail: reben@abennacional.org.br

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[1] Corresponding author: Antonio Dean Barbosa Marques. E-mail: antonio-dean@hotmail.com