Table 4.

Results of the questionnaire designed based on [49-51] for evaluating user interfaces and virtual reality apps, respectively (Tables S1-S4 of Multimedia Appendix 1 provides the noncompressed version of Tables 4-7 containing the list of questions).

Usability heuristic and question			Question, mean (SD)		Heuristic, mean (SD)		Heuristic overall percent, %
1. Natural engagement
	Q1	3.5 (1.08)		3.7 (0.28)		74
	Q2	3.9 (0.88)		N/Aa		N/A
2. Compatibility with the user’s task and domain
	Q3	3.7 (0.95)		3.7 (0.3)		74
	Q4	4 (1.25)		N/A		N/A
	Q5	3.4 (1.17)		N/A		N/A
3. Natural expression of action
	Q6	3.5 (1.27)		3.2 (0.42)		64
	Q7	2.9 (1.20)		N/A		N/A
4. Close coordination of action and representation
	Q8	3.5 (1.27)		3.6 (0.1)		72
	Q9	3.6 (1.17)		N/A		N/A
	Q10	3.7 (1.25)		N/A		N/A
5. Realistic feedback
	Q11	3.7 (1.4)		3.7 (1.4)		74
6. Faithful viewpoints
	Q12	3.6 (1.2)		3.6 (1.2)		72
7. Navigation and orientation support
	Q13	4.1 (1.2)		4.1 (1.2)		82
8. Visibility of system status
	Q14	3.7 (1.25)		3.63 (0.75)		72.5
	Q15	3.4 (1.17)		N/A		N/A
	Q16	3.7 (1.49)		N/A		N/A
	Q17	3.7 (1.16)		N/A		N/A
9. Consistency and standards
	Q18	3.7 (1.3)		3.7 (1.3)		74
10. Error prevention
	Q19	3.7 (1.34)		3.5 (0.28)		70
	Q20	3.3 (2)		N/A		N/A
11. Recognition rather than recall
	Q21	3.6 (1.2)		3.6 (1.2)		72
12. Flexibility and efficiency of use
	Q22	3.8 (1.0)		3.8 (1.0)		76
14. Help and documentation
	Q23	2.9 (1.4)		2.9 (1.4)		58

^aN/A: not applicable.