Table 3.

Usability problems.

Severity levelsa	Categories	Subcategories	Codes, n
3	Operation	I did not know how to input data (including input of data using previous entries and input of expected delivery date)	4
3	Content	I did not know what to input as the password, display name, and action goal	4
3	Description	Screen display and text were cut off	4
2	Content	I am unsure how to convert standing, lifting, and working hours	5
2	Content	I am unsure how to input the presence or degree of physical symptoms	3
1	Operation	I am not confident that I am using the system correctly	3
1	Operation	The slider input system is hard to use	8

^aHigher numbers indicate greater severity [31].