TABLE 5.

Mean score of individual questions.

Mean score for individual questions for each platform
Mean (SD)				Wilcoxon sign test
		HMD	Desktop	Z	p
Group of seniors	Intelligibility	$2.71(1.34)$	$3.45(1.35)$	–1.66	0.097
	Preference	$3.11(1.52)$	$3.02(1.46)$	–0.07	0.948
	Spatial orientation	$2.94(1.53)$	$3.42(1.28)$	–1.3	0.195
	Input controls	$2.91(1.44)$	$3.65(1.25)$	–1.77	0.077
	Enjoyment	$3.11(1.36)$	$3.14(1.28)$	–0.16	0.874
Group of young adults	Intelligibility	$2.6(1.11)$	$2.36(1.11)$	–0.83	0.408
	Preference	$4.2(1.11)$	$2.04(0.97)$	–3.42	0.001*
	Spatial orientation	$3.28(1.2)$	$2.88(1.01)$	–1.01	0.315
	Input controls	$3.16(1.43)$	$3.2(1.11)$	–0.09	0.926
	Enjoyment	$4.32(0.9)$	2   (0.81)	–3.98	$<{0.001}^{*}$

We report mean scores (SD) for individual statements from the usability questionnaire for each platform and group separately. The difference is reported with corresponding statistics. Significant effects after applying the Bonferroni correction (α = 0.01) are marked with a symbol ^*.