Table 3.

Differences in cortical activity during acoustic stimulation between the healthy subjects and tinnitus patients.

	Tinnitus Group		Control Group		Significance of Levene's test	Variance in 2 groups	statistics t	df	Significance of t test (2-tail)	95%	CI
Variable	Mean	SD	Mean	SD						min	max
Amax for O1Fpz	115.9	44.0	93.7	34.1	0.158	Equal	2.21	73	0.030	2.2	42.2
Am (Al) for O1Fpz	74.7	33.8	56.3	32.5	0.624	Equal	2.26	73	0.027	2.2	34.8
Aav (Al) for O1Fpz	24.7	13.0	18.4	12.0	0.365	Equal	2.00	73	0.049	0.0	12.4
Am (Al) for F8Fpz	26.7	12.2	18.8	12.7	0.529	Equal	2.59	73	0.011	1.8	13.9
Aav (Bl) for F8Fpz	4.54	1.64	3.76	0.97	0.053	Equal	2.19	73	0.032	0.07	1.49
Amax for T6Fpz	103.8	44.7	79.7	39.8	0.421	Equal	2.28	73	0.026	3.0	45.1
Average for T6Fpz	22.0	8.2	17.6	9.1	0.806	Equal	2.12	73	0.037	0.3	8.6
Am (Al) for T6Fpz	57.9	24.1	41.1	27.4	0.813	Equal	2.72	73	0.008	4.5	29.1
Aav (Al) for T6Fpz	18.6	8.9	13.6	9.7	0.909	Equal	2.24	73	0.028	0.6	9.5
Am (Bl) for T6Fpz	25.8	9.8	20.9	9.7	0.981	Equal	2.04	73	0.045	0.1	9.6

Abbreviations: Aav: average amplitude; Amax: maximal amplitude; 95% CI: 95% confidence interval; SD: standard deviation. Rhythms: A  =  alpha, B  =  beta, D  =  delta. Cortical regions: T  =  temporal, P  =  parietal, F  =  frontal, O  =  occipital, C  =  central.