Table 2.

Comparison of Means ±S.D. for subjective parameters and performance in three task difficulty levels

Parameters	Level of task difficulty			Results	Size effect
	LDL	MDL	HDL	P value
M D	18.97 ± 16.83	37.77 ± 20.2	64.4 ± 22.19	<0.001	0.640
P	17.07 ± 13.05	35.79 ± 18.91	65.1 ± 21.56	<0.001	0.647
EF	17.26 ± 14.09	35.34 ± 18.54	64.08 ± 21.63	<0.001	0.626
AN	45.9 ± 30.71	45.47 ± 42.28	44.61 ± 31.06	0.365	0.002
LO	45.47 ± 30.29	44.18 ± 17.1	45.18 ± 30.82	0.355	0.004
TLX-avg	17.34 ± 12.25	36.3 ± 3.42	64.30 ± 19.76	<0.001	0.723
R T	1.36 ± 0.37	1.85 ± 0.56	2.23 ± 0.56	<0.001	0.340
M R	19.94 ± 12.58	15.47 ± 8.30	36.19 ± 13.3	<0.001	0.574
C R	52.2 ± 15.4	61.47 ± 10.97	34.18 ± 9.32	<0.001	0.424

MD Mental Demand, PD Performance, EF Effort, L Loudness, AN Annoyance, RT Reaction Time, MR missed responses, CR Correct Rate