Table 3. Average detection accuracy across all subjects under different situations.

Stimulus Frequency (Hz)		33.33	25	16.67	12.5	8.33	6.25
Detection using the first harmonic	Accuracy (Cz reference)	0.49	0.39	0.3	0.27	0.22	0.2
	Accuracy (mastoid average reference)	0.46	0.4	0.29	0.28	0.22	0.2
	Accuracy (common average reference)	0.47	0.4	0.31	0.27	0.23	0.21
	Accuracy (optimum reference)	0.63	0.5	0.44	0.42	0.27	0.32
	ANOVA ‘p’ (optimum vs Cz)	0.01	0.01	0.01	0.02	0.04	0.02
	ANOVA ‘p’ (optimum vs mastoid)	0.01	0.01	0.01	0.03	0.03	0.01
	ANOVA ‘p’ (optimum vs common)	0.01	0.02	0.01	0.01	0.02	0.01
Detection using the first and second harmonic	Accuracy (Cz reference)	0.49	0.39	0.7	0.68	0.72	0.75
	Accuracy (mastoid average reference)	0.46	0.4	0.71	0.7	0.71	0.75
	Accuracy (common average reference)	0.47	0.4	0.7	0.72	0.72	0.73
	Accuracy (optimum reference)	0.63	0.5	0.79	0.83	0.85	0.82
	ANOVA ‘p’ (optimum vs Cz)	0.0	0.0	0.01	0.0	0.0	0.01
	ANOVA ‘p’ (optimum vs mastoid)	0.01	0.01	0.01	0.0	0.0	0.01
	ANOVA ‘p’ (optimum vs common)	0.0	0.01	0.01	0.0	0.01	0.01