. 2020 Dec 8;4(1):e20633. doi: 10.2196/20633

Table 7.

Friedman test and Wilcoxon signed-rank test results on the comparison survey between the display systems.

Comparison survey	Friedman test χ² (P value)	Wilcoxon signed-rank test z-score (P value)
	Between display systems	CDS^a vs NIV^b	CDS vs FIV^c	FIV vs FIV
Preference	31.5 (<.001)	3.33 (<.001)	4.11 (<.001)	1.83 (.049)
Easiness	20.6 (<.001)	2.39 (.01)	1.93 (.047)	–0.80 (.63)

^aCDS: conventional display system.

^bNIV: nonimmersive virtual reality display system.

^cFIV: full-immersive virtual reality display system